Non-linear careers
Chapter 5 of 5

Non-linear careers

Zigzag careers, late starts and broad experience are often treated as risky. The evidence says early stars rarely become adult stars, great work tends to come later than we think, and your best work can arrive at any point. It also says depth and task-related skills still matter. This chapter shows how to combine both.

About 30 minutes44 sourcesInteractive labs and a quiz
~90%
of world top-10 youth and adult chess players are different people
Source 4: Güllich et al., 2025
45.0
average age of founders of the fastest-growing 0.1% of US start-ups
Source 22: Azoulay et al., 2020
12.9
jobs held from age 18 to 58 by US workers born 1957 to 1964. Nobody counts "careers".
Source 33: US BLS, 2025
Any time
a scientist's top paper is equally likely anywhere in their sequence of work
Source 16: Sinatra et al., 2016

The big idea

The traditional career story is a ladder: pick a field early, specialise hard, climb steadily and peak young. Schools, talent programmes, hiring managers and investors are often built around that model. They select early high performers, reward narrow focus and treat late starters or frequent switchers as risky.

A non-linear career does not follow that ladder. It zigzags between roles, pivots to a new occupation, combines fields, starts late or produces its best work late. This chapter asks what the evidence says about those paths.

The short answer is more interesting than "generalists win". Among people who reach the very top, many sampled broadly and progressed slowly at first [1Meta-analysisWhat makes a champion? Early multidisciplinary practice, not early specialization, predicts world-class performanceGüllich et al., 2022 · Perspectives on Psychological Science 17:6-29, 2Meta-analysisPredictors of junior versus senior elite performance are opposite: a systematic review and meta-analysis of participation patternsBarth et al., 2022 · Sports Medicine, 4ReviewRecent discoveries on the acquisition of the highest levels of human performanceGüllich et al., 2025 · Science 390]. Breakthrough work in science and business tends to come in middle age, not youth [18Primary studyAge and great inventionJones, 2010 · Review of Economics and Statistics 92:1-14, 19Primary studyAge dynamics in scientific creativityJones & Weinberg, 2011 · PNAS 108, 22Primary studyAge and high-growth entrepreneurshipAzoulay et al., 2020 · American Economic Review: Insights 2:65-82]. Your best work can come at any point in your sequence of output [16Primary studyQuantifying the evolution of individual scientific impactSinatra et al., 2016 · Science 354, 15Primary studyHot streaks in artistic, cultural, and scientific careersLiu et al., 2018 · Nature 559:396-399]. But deep, field-specific experience still pays strongly [22Primary studyAge and high-growth entrepreneurshipAzoulay et al., 2020 · American Economic Review: Insights 2:65-82, 23Primary studyOccupational specificity of human capitalKambourov & Manovskii, 2009 · International Economic Review 50:63-115], and changing jobs or fields has real costs.

Breadth versus early specialisation

Early stars and adult stars are mostly different people

The strongest evidence comes from sport, where performance is easy to measure. A meta-analysis of 51 reports covering 6,096 athletes compared adult world-class athletes with national-level peers [1Meta-analysisWhat makes a champion? Early multidisciplinary practice, not early specialization, predicts world-class performanceGüllich et al., 2022 · Perspectives on Psychological Science 17:6-29]. As children and teenagers, the world-class athletes had done more coach-led practice in other sports. They started their main sport later, accumulated less practice in it and progressed more slowly at first.

Among junior athletes, the pattern was reversed: the best juniors started earlier, specialised more and improved faster. A larger meta-analysis of 9,241 athletes confirmed it. The factors that predict junior success are the opposite of those that predict adult world-class success [2Meta-analysisPredictors of junior versus senior elite performance are opposite: a systematic review and meta-analysis of participation patternsBarth et al., 2022 · Sports Medicine].

Talent programmes show the same flip.

Does joining a talent programme early help?
Effect of earlier entry into talent programmes (d). Negative means earlier entry went with better performance.
Junior performance−0.53
Senior performance+0.56
Source: Güllich & Barth, 2023 [3Meta-analysisEffects of early talent promotion on junior and senior performance: a systematic review and meta-analysisGüllich & Barth, 2023 · Sports Medicine]. Earlier entry went with better junior results and worse senior results.

In 2025, the same research group reviewed data on 34,839 adult top performers across science, classical music, chess and sport [4ReviewRecent discoveries on the acquisition of the highest levels of human performanceGüllich et al., 2025 · Science 390]. They found that early and later top performers are largely different people. For example, the world top 10 youth and adult chess players are nearly 90% different individuals. Most eventual top achievers performed below many of their peers early on. The authors propose three explanations for why early breadth helps at the top:

  • Better search and match: trying several things helps you find the one that fits you best.
  • More learning capital: varied experience builds skills and learning habits that transfer.
  • Lower risks: less early burnout and injury from narrow, intense training.

Sampling improves fit

Choosing a career is a bit like buying shoes without trying them on. Economist Boyan Jovanovic modelled job fit as something you only learn by doing the job, which makes changing jobs a rational search for better fit [6Primary studyJob matching and the theory of turnoverJovanovic, 1979 · Journal of Political Economy 87:972-990].

A natural experiment in the UK tested this for education [5Primary studyDiscovering one's talent: learning from academic specializationMalamud, 2011 · ILR Review 64(2)]. English university students specialise in one subject from day one; Scottish students study several subjects for two years before choosing. If sampling just wasted time, Scottish graduates should switch fields more. Instead, they were about 6 percentage points less likely to end up in an occupation unrelated to their degree. Wales, which follows the English timetable, showed no difference from England. The information gained by sampling seemed to outweigh the time lost.

Kind and wicked environments

Why might breadth help more in some fields than others? In kind learning environments like chess or golf, feedback is quick and accurate and the rules stay the same, so early, intense, narrow practice works well. In wicked environments, feedback is slow, noisy or misleading and the rules change [7ReviewThe two settings of kind and wicked learning environmentsHogarth et al., 2015 · Current Directions in Psychological Science 24:379-385]. Intuition built in one narrow context can then mislead you [8ReviewConditions for intuitive expertise: a failure to disagreeKahneman & Klein, 2009 · American Psychologist 64:515-526]. Journalist David Epstein popularised the argument that breadth matters most in wicked domains [9BookRange: Why Generalists Triumph in a Specialized WorldEpstein, 2019 · Riverhead Books]. That link is a reasonable inference from the framework rather than a directly tested career result.

Explore, then exploit

The restaurant problem

Imagine you move to a new city with 20 restaurants. Each night you can return to your favourite so far (exploit) or try a new one (explore). Explore too little and you may never find the best one. Explore too much and you waste evenings on bad meals. The right balance depends on how long you will stay: with years ahead, explore a lot early; if you leave tomorrow, go to your favourite [12BookAlgorithms to Live By: The Computer Science of Human DecisionsChristian & Griffiths, 2016 · Henry Holt].

Careers have the same structure. Early on, the time remaining is long, so trying roles, fields and skills has high value. Later, using what you know works pays more. Developmental psychologist Alison Gopnik argues that our long human childhood is an evolved version of this schedule: a protected period of broad search before adult life [11ReviewChildhood as a solution to explore-exploit tensionsGopnik, 2020 · Philosophical Transactions of the Royal Society B 375:20190502]. Organisation theorist James March showed that institutions tend to drift toward exploitation because its rewards are faster and more certain, which can be self-defeating over time [10Primary studyExploration and exploitation in organizational learningMarch, 1991 · Organization Science 2:71-87].

Try it yourself.

Interactive lab

Explore or exploit: a 25-turn career

Four paths pay off differently, and each payoff is noisy, like real jobs. You have 25 turns. Each turn, pick a path and collect what it pays. Try a little of everything, or commit early? There is no single right answer, which is the point.

Turn 1 of 25Total so far: 0.0

Pick any path to begin. The true averages are revealed at the end.

Real careers break the simple version of this game in three ways: the paths change over time as industries rise and fall, choosing a path changes you as skills build up, and switching has costs. Treat the game as a way to feel the trade-off, not as a literal model.

Hot streaks follow exploration

A study of 2,128 artists, 4,337 film directors and 20,040 scientists found that hot streaks, periods of unusually high-impact work, tended to begin right after a shift from exploring diverse styles or topics to focusing on one [13Primary studyUnderstanding the onset of hot streaks across artistic, cultural, and scientific careersLiu et al., 2021 · Nature Communications 12]. Exploration alone, or focus alone, showed no such link. The sequence mattered: wide first, then deep. That sequence raised the chance of a hot streak by about 14% to 21% compared with a random point in the career [14Secondary sourceWhen you're hot, you're hot; What triggers a career hot streak?Kellogg Insight, 2018 and 2021 · Kellogg School of Management].

When success arrives

Older than you think

In US Census data covering 2.7 million founders of firms with employees, the average founder was about 42 [22Primary studyAge and high-growth entrepreneurshipAzoulay et al., 2020 · American Economic Review: Insights 2:65-82]. Founders of the fastest-growing 0.1% of start-ups were older, not younger.

How old are the founders of the most successful start-ups?
Average founder age by growth tier, US start-ups
All start-ups41.8 years
Top 1% by growth43.7 years
Top 0.1% by growth45.0 years
Successful exit46.7 years
Source: Azoulay et al., 2020 [22Primary studyAge and high-growth entrepreneurshipAzoulay et al., 2020 · American Economic Review: Insights 2:65-82] (working-paper tables).

Among people who start a company, a 50-year-old founder is about 1.8 times as likely as a 30-year-old to build one of the fastest-growing firms. But read the reason carefully. A large part of it is experience in the same industry: founders with three or more years in their start-up's narrow industry had roughly double the rate of top growth (about 0.26% versus 0.12%) compared with those with none [22Primary studyAge and high-growth entrepreneurshipAzoulay et al., 2020 · American Economic Review: Insights 2:65-82]. This supports late success, but not the myth of the inexperienced outsider genius.

Great work is coming later in life

Across the 20th century, the average age at which people produced Nobel-winning work and great inventions rose by about six years [18Primary studyAge and great inventionJones, 2010 · Review of Economics and Statistics 92:1-14]. Economist Benjamin Jones links this to the "burden of knowledge": as fields accumulate more knowledge, it takes longer to reach the frontier.

How old were Nobel laureates when they did their prize-winning work?
Average age at the prize-winning work, by era
36.9
50.3
Physics
36.1
46.3
Chemistry
37.6
45
Medicine
Work done before 1905Work done after 1985
Source: Jones & Weinberg, 2011 [19Primary studyAge dynamics in scientific creativityJones & Weinberg, 2011 · PNAS 108], values as reported by Lindau Nobel Laureate Meetings [20Secondary sourceGeniuses are getting olderLindau Nobel Laureate Meetings, 2016 · lindau-nobel.org].

Economist David Galenson describes two kinds of creative careers [21BookOld Masters and Young Geniuses: The Two Life Cycles of Artistic CreativityGalenson, 2006 · Princeton University Press]. Conceptual innovators make sudden, idea-driven breakthroughs and tend to peak young. Experimental innovators work by trial and error and tend to peak late. His evidence relies on selected examples, so treat it as a useful lens rather than a law.

Your best work can come at any point

Physicist Roberta Sinatra and colleagues studied the publication histories of 2,887 physicists and scientists in other fields [16Primary studyQuantifying the evolution of individual scientific impactSinatra et al., 2016 · Science 354]. Each scientist's most-cited paper was equally likely to be anywhere in their sequence of papers: first, middle or last. They described each paper's impact as a stable personal ability (which they called Q) multiplied by luck. This is the random-impact rule.

A related study of 3,480 artists, 6,233 film directors and 20,040 scientists found that top works cluster in hot streaks, and the start of a streak is random within a career [15Primary studyHot streaks in artistic, cultural, and scientific careersLiu et al., 2018 · Nature 559:396-399]. About 90% of people in all three groups had at least one hot streak [14Secondary sourceWhen you're hot, you're hot; What triggers a career hot streak?Kellogg Insight, 2018 and 2021 · Kellogg School of Management].

Why, then, does great work seem to cluster in mid-career? Because most people produce the most work in mid-career. More attempts mean more chances, even with the same odds per attempt. Psychologist Dean Simonton made the same point decades earlier: what matters is career age, the years since you entered a field, not the age on your birth certificate [17Primary studyCreative productivity: a predictive and explanatory model of career trajectories and landmarksSimonton, 1997 · Psychological Review 104:66-89]. A late start shifts the curve; it does not cancel it.

Interactive model

When does someone's best work happen?

This simulates 3,000 careers. Every piece of work has the same odds of being the hit, wherever it falls in the sequence. Then it asks where each career's single best piece landed. Switch between counting by position in the body of work and by calendar year of the career.

Where the best work landed, in tenths of the body of work

Counted by position, the best work is spread evenly. The first tenth of someone's output is as likely to hold their best piece as the last tenth. Each attempt is a fresh draw.

A teaching simulation of the random-impact idea from studies of scientific careers. Output curves and numbers are illustrative, not fitted to real data.

Changing jobs and fields: the real numbers

The "seven careers" myth

You may have read that the average person changes careers five to seven times. No data support this. The US Bureau of Labor Statistics says it has never estimated the number of career changes, because there is no agreed definition of what counts as one [34Official statisticsNational Longitudinal Surveys: frequently asked questionsUS BLS, NLS FAQ · bls.gov]. A Wall Street Journal investigation traced the claim and found no source [35Secondary sourceSeven careers in a lifetime? Think twice, researchers sayBialik, 2010 · The Wall Street Journal].

What BLS does measure is jobs, meaning periods of work with one employer. People born between 1957 and 1964 held an average of 12.9 jobs between ages 18 and 58 [33Official statisticsNumber of jobs, labor market experience, marital status, and health for those born 1957-1964 (USDL-25-1322)US BLS, 2025 · BLS news release].

How many jobs do people hold at different ages?
Average number of jobs (employer spells) started in each age bracket, US workers born 1957 to 1964
Ages 18 to 245.6
Ages 25 to 344.5
Ages 35 to 442.9
Ages 45 to 542.2
Ages 55 to 581.3
Source: US Bureau of Labor Statistics, 2025 [33Official statisticsNumber of jobs, labor market experience, marital status, and health for those born 1957-1964 (USDL-25-1322)US BLS, 2025 · BLS news release]. A job that spans two brackets is counted in both.

Most job changes happen early and most stay within the same kind of work. Young workers today still hold at least seven jobs in their first one to two decades [37Primary studySeven jobs in a lifetime? An analysis of employee tenureBaum, 2021 · Economic Inquiry], and a classic study found that job changes account for at least a third of young men's early wage growth [32Primary studyJob mobility and the careers of young menTopel & Ward, 1992 · Quarterly Journal of Economics 107:439-479]. Despite talk of "boundaryless" careers, median time with the current employer in the US was 4.1 years in January 2026, up from 3.9 in 2024 [36Official statisticsEmployee tenure in 2026 (USDL-26-1532)US BLS, 2026 · BLS news release].

Does job hopping pay?

On average, people who switch employers see faster pay growth than those who stay. In mid-2026, the Atlanta Fed's tracker showed median annual wage growth of 4.4% for switchers versus 3.6% for stayers [38Official statisticsWage Growth TrackerFederal Reserve Bank of Atlanta, 2026 · atlantafed.org]. But the gap swings with the job market, and it briefly disappeared in 2025 [39Secondary sourceIt pays to job switch again, but not everyone has that luxuryHoff, 2026 · Business Insider]. Switching pays most when employers are competing for workers.

The cost of jumping too far

Not all skills travel. Five years in an occupation goes with 12% to 20% higher wages, and once that is accounted for, time with the same employer or industry adds little [23Primary studyOccupational specificity of human capitalKambourov & Manovskii, 2009 · International Economic Review 50:63-115]. So leaving an occupation can throw away real value.

The good news: skills are tied to tasks (analytical, manual, people-facing), not job titles. Moving to an occupation with similar tasks keeps much of your skill value. Most people do move to task-similar occupations, and task-specific skills account for up to 52% of individual wage growth [24Primary studyHow general is human capital? A task-based approachGathmann & Schönberg, 2010 · Journal of Labor Economics 28:1-49].

Breadth across functions, depth within an industry

LinkedIn data on about 459,000 former management consultants found that working in more business functions raised the odds of becoming an executive, while switching industries lowered them [26Secondary sourceHow to become a C.E.O.? The quickest path is a winding oneNew York Times, 2016 · The New York Times]. Among large-company CEOs, those with broader experience across positions, firms and industries earned about 19% more, especially in companies going through restructuring [27Primary studyGeneralists versus specialists: lifetime work experience and chief executive officer payCustódio et al., 2013 · Journal of Financial Economics 108:471-492]. Combined with the founder data, a reasonable synthesis is: broad across functions, deep within an industry. No single study has tested that head to head.

Combining fields

Across 17.9 million scientific papers, the highest-impact work was mostly conventional but contained an unusual combination of ideas; such papers were about twice as likely to be big hits [25Primary studyAtypical combinations and scientific impactUzzi et al., 2013 · Science 342:468-472]. Breadth has a price, though. Highly interdisciplinary scientists earn more citations but publish fewer papers [29Primary studyProminent but less productive: the impact of interdisciplinarity on scientists' researchLeahey et al., 2017 · Administrative Science Quarterly 62:105-139], and across 18,476 Australian grant proposals, the more interdisciplinary the proposal, the lower its chance of funding [30Primary studyInterdisciplinary research has consistently lower funding successBromham et al., 2016 · Nature 534]. Nobel laureates were more likely than other scientists to have serious arts or crafts hobbies [28Primary studyArts foster scientific success: avocations of Nobel, National Academy, Royal Society, and Sigma Xi membersRoot-Bernstein et al., 2008 · Journal of Psychology of Science and Technology 1:51-63], but famous people's biographies record hobbies far more fully than surveys of ordinary people do, so treat that as a weak signal.

Setbacks sort people

Among early-career scientists who applied for a major US research grant, those who just missed the funding line were more likely to leave science than those who just made it. But among those who stayed, the near-missers went on to publish a higher share of hit papers (16.1% versus 13.3%) [31Primary studyEarly-career setback and future career impactWang et al., 2019 · Nature Communications 10]. Early setbacks can filter and strengthen at the same time.

How people actually change careers

Organisational researcher Herminia Ibarra followed 39 professionals through career changes over two to three years [40BookWorking Identity: Unconventional Strategies for Reinventing Your CareerIbarra, 2003 · Harvard Business School Press]. The successful ones rarely planned the perfect move first and then executed it. Instead they ran small experiments: side projects, temporary assignments, courses. They built new networks in the target field, and they repeatedly re-told their own story until the new identity fit. Often they were already deep in the new field before they formally switched. This is qualitative research on a small group, so treat it as a rich description rather than proof.

People who change careers do seem to benefit on average. In an Australian panel survey, career changers reported higher job satisfaction, better job security and fewer working hours a year later [41Primary studyA longitudinal study of the determinants and outcomes of career changeCarless & Arnup, 2011 · Journal of Vocational Behavior 78:80-91]. People who see their career as self-directed, sometimes called a protean career [43ReviewThe protean career: a quarter-century journeyHall, 2004 · Journal of Vocational Behavior 65:1-13], report more career satisfaction, but this attitude is only weakly linked to pay or promotion [42Meta-analysisProtean and boundaryless career orientations: a critical review and meta-analysisWiernik & Kostal, 2019 · Journal of Counseling Psychology 66:280-307].

Designing your own path

  1. Sample widely before committing, especially earlyModerate evidence

    Later specialisers are less likely to end up in an unrelated field [5Primary studyDiscovering one's talent: learning from academic specializationMalamud, 2011 · ILR Review 64(2)], and world-class adults typically sampled more [1Meta-analysisWhat makes a champion? Early multidisciplinary practice, not early specialization, predicts world-class performanceGüllich et al., 2022 · Perspectives on Psychological Science 17:6-29, 4ReviewRecent discoveries on the acquisition of the highest levels of human performanceGüllich et al., 2025 · Science 390].

  2. Do not read early results as destinyModerate evidence

    For yourself or for people you hire: early and adult top performers are largely different people [4ReviewRecent discoveries on the acquisition of the highest levels of human performanceGüllich et al., 2025 · Science 390], and early talent selection predicts junior, not senior, success [3Meta-analysisEffects of early talent promotion on junior and senior performance: a systematic review and meta-analysisGüllich & Barth, 2023 · Sports Medicine].

  3. Explore, then deliberately go deepModerate evidence

    Hot streaks follow a phase of wide exploration and then focus [13Primary studyUnderstanding the onset of hot streaks across artistic, cultural, and scientific careersLiu et al., 2021 · Nature Communications 12]. After experimenting, commit to the most promising thread.

  4. Pivot along task linesStrong evidence

    Moving to work with similar tasks keeps much of your skill value [24Primary studyHow general is human capital? A task-based approachGathmann & Schönberg, 2010 · Journal of Labor Economics 28:1-49]; a distant jump resets the occupation premium [23Primary studyOccupational specificity of human capitalKambourov & Manovskii, 2009 · International Economic Review 50:63-115].

  5. If you want to found a company, build industry depth firstStrong evidence

    Three or more years in the industry roughly doubled the chance of top growth, and success odds rise with age [22Primary studyAge and high-growth entrepreneurshipAzoulay et al., 2020 · American Economic Review: Insights 2:65-82].

  6. Broaden across functions before broadening across industriesModerate evidence

    Linked to better executive odds and higher CEO pay [26Secondary sourceHow to become a C.E.O.? The quickest path is a winding oneNew York Times, 2016 · The New York Times, 27Primary studyGeneralists versus specialists: lifetime work experience and chief executive officer payCustódio et al., 2013 · Journal of Financial Economics 108:471-492].

  7. Keep producingModerate evidence

    Each piece of work is a fresh draw for a hit [16Primary studyQuantifying the evolution of individual scientific impactSinatra et al., 2016 · Science 354, 17Primary studyCreative productivity: a predictive and explanatory model of career trajectories and landmarksSimonton, 1997 · Psychological Review 104:66-89]. Volume alone is not enough; quality still matters.

  8. Count career age, not birth ageModerate evidence

    A late start shifts the curve rather than cancelling it [17Primary studyCreative productivity: a predictive and explanatory model of career trajectories and landmarksSimonton, 1997 · Psychological Review 104:66-89], and mid-life peaks are the norm in several fields [19Primary studyAge dynamics in scientific creativityJones & Weinberg, 2011 · PNAS 108, 22Primary studyAge and high-growth entrepreneurshipAzoulay et al., 2020 · American Economic Review: Insights 2:65-82].

  9. Change careers by experiment, not by leapWeak or early evidence

    Side projects, new networks and a retold story [40BookWorking Identity: Unconventional Strategies for Reinventing Your CareerIbarra, 2003 · Harvard Business School Press].

  10. Switch employers when the market rewards itModerate evidence

    Switchers usually out-earn stayers, but the premium moves with the job market [38Official statisticsWage Growth TrackerFederal Reserve Bank of Atlanta, 2026 · atlantafed.org, 39Secondary sourceIt pays to job switch again, but not everyone has that luxuryHoff, 2026 · Business Insider].

  11. Combine solid depth with one unusual ingredientModerate evidence

    Mostly conventional work with a rare combination is most likely to be a hit [25Primary studyAtypical combinations and scientific impactUzzi et al., 2013 · Science 342:468-472].

  12. Budget for the breadth penaltyModerate evidence

    Cross-field work can mean slower output and harder funding [29Primary studyProminent but less productive: the impact of interdisciplinarity on scientists' researchLeahey et al., 2017 · Administrative Science Quarterly 62:105-139, 30Primary studyInterdisciplinary research has consistently lower funding successBromham et al., 2016 · Nature 534]. Plan runway or find collaborators.

Myths and what the evidence says

In sport, adult world-class athletes typically sampled more and specialised later. Early specialisation predicts junior success, not adult world-class success [1Meta-analysisWhat makes a champion? Early multidisciplinary practice, not early specialization, predicts world-class performanceGüllich et al., 2022 · Perspectives on Psychological Science 17:6-29, 2Meta-analysisPredictors of junior versus senior elite performance are opposite: a systematic review and meta-analysis of participation patternsBarth et al., 2022 · Sports Medicine]. Similar patterns appear in science, music and chess [4ReviewRecent discoveries on the acquisition of the highest levels of human performanceGüllich et al., 2025 · Science 390].

Youth and adult top performers are largely different people, with nearly 90% turnover in several datasets [4ReviewRecent discoveries on the acquisition of the highest levels of human performanceGüllich et al., 2025 · Science 390].

Founders of the fastest-growing start-ups averaged 45 [22Primary studyAge and high-growth entrepreneurshipAzoulay et al., 2020 · American Economic Review: Insights 2:65-82], and physics Nobel work since 1980 was done at about 48 on average [19Primary studyAge dynamics in scientific creativityJones & Weinberg, 2011 · PNAS 108].

No data support it. BLS has never estimated career changes [34Official statisticsNational Longitudinal Surveys: frequently asked questionsUS BLS, NLS FAQ · bls.gov], and the claim has no traceable source [35Secondary sourceSeven careers in a lifetime? Think twice, researchers sayBialik, 2010 · The Wall Street Journal]. BLS does count jobs: 12.9 from age 18 to 58 [33Official statisticsNumber of jobs, labor market experience, marital status, and health for those born 1957-1964 (USDL-25-1322)US BLS, 2025 · BLS news release].

On average switchers' pay grows faster [38Official statisticsWage Growth TrackerFederal Reserve Bank of Atlanta, 2026 · atlantafed.org, 32Primary studyJob mobility and the careers of young menTopel & Ward, 1992 · Quarterly Journal of Economics 107:439-479], though the premium varies with the market [39Secondary sourceIt pays to job switch again, but not everyone has that luxuryHoff, 2026 · Business Insider]. Switching far from your tasks can destroy skill value [24Primary studyHow general is human capital? A task-based approachGathmann & Schönberg, 2010 · Journal of Labor Economics 28:1-49].

Founders with years in the same industry had about double the rate of top growth [22Primary studyAge and high-growth entrepreneurshipAzoulay et al., 2020 · American Economic Review: Insights 2:65-82].

Breadth helps with fit, combination and adaptability [5Primary studyDiscovering one's talent: learning from academic specializationMalamud, 2011 · ILR Review 64(2), 25Primary studyAtypical combinations and scientific impactUzzi et al., 2013 · Science 342:468-472]; depth drives wages and success within a field [23Primary studyOccupational specificity of human capitalKambourov & Manovskii, 2009 · International Economic Review 50:63-115, 22Primary studyAge and high-growth entrepreneurshipAzoulay et al., 2020 · American Economic Review: Insights 2:65-82]. The best-supported pattern is breadth first, then depth.

Late success is common in aggregate data [22Primary studyAge and high-growth entrepreneurshipAzoulay et al., 2020 · American Economic Review: Insights 2:65-82], but famous late bloomers are a survivorship-biased sample. Use the aggregate data, not the anecdotes.

Check your understanding

Question 1 of 5
What did meta-analyses find about world-class adult athletes compared with national-level peers?
Question 2 of 5
Why does great work seem to cluster in mid-career if impact is random across a sequence of work?
Question 3 of 5
What is the strongest predictor of founding a top-growth start-up in the Census data?
Question 4 of 5
What does BLS say about the claim that people change careers seven times?
Question 5 of 5
Which kind of career move keeps the most of your skill value?
Answered 0 of 5. Pick an answer to see the explanation.

Words to know

Non-linear career
A working life with pivots, combined fields, late starts or late peaks, rather than one steady climb.
Early specialisation
Focusing intensively on one domain from a young age.
Sampling period
A stretch of trying several domains before committing to one.
Match quality
How well a person fits a job or field, often unknown until tried.
Explore-exploit trade-off
The tension between trying new options and using the best one found so far.
Kind environment
A setting with quick, accurate feedback and stable rules.
Wicked environment
A setting where feedback is slow, missing or misleading, or the rules change.
Career age
Years since entering a field, as opposed to age since birth.
Random-impact rule
Your best work is equally likely to be anywhere in your sequence of work.
Hot streak
A burst of work with impact well above your usual level.
Occupation-specific skills
Skills that are valuable mainly in one occupation.
Task-specific skills
Skills tied to a mix of tasks, which transfer to occupations with similar tasks.
Protean career
A self-directed career guided by personal values rather than an organisation.
Job (BLS definition)
An unbroken period of work with one employer. Not the same as a career.
Survivorship bias
Drawing conclusions from visible successes while ignoring those who tried the same path and failed.

Sources

Every claim on this page links to one of these. Primary studies and meta-analyses carry the most weight; books and secondary sources are used for history and context.

  1. 1
    Güllich A, Macnamara BN, Hambrick DZ (2022). What makes a champion? Early multidisciplinary practice, not early specialization, predicts world-class performance. Perspectives on Psychological Science 17:6-29.
    51 reports, 6,096 athletes: world-class adults sampled more sports and specialised later.
  2. 2
    Barth M, Güllich A, Macnamara BN, Hambrick DZ (2022). Predictors of junior versus senior elite performance are opposite: a systematic review and meta-analysis of participation patterns. Sports Medicine.
    71 reports, 9,241 athletes: what predicts junior success predicts the opposite at senior level.
  3. 3
    Güllich A, Barth M (2023). Effects of early talent promotion on junior and senior performance: a systematic review and meta-analysis. Sports Medicine.
    Early talent-programme entry helps juniors and goes with worse senior results.
  4. 4
    Güllich A, Barth M, Hambrick DZ, Macnamara BN (2025). Recent discoveries on the acquisition of the highest levels of human performance. Science 390.
    34,839 top performers: early stars and adult stars are largely different people.
  5. 5
    Malamud O (2011). Discovering one's talent: learning from academic specialization. ILR Review 64(2).
    Later specialisers in Scotland were less likely to switch to an unrelated field than English students.
  6. 6
    Jovanovic B (1979). Job matching and the theory of turnover. Journal of Political Economy 87:972-990.
    Primary studydoi:10.1086/260808
    Fit with a job is learned on the job; changing jobs can be rational search.
  7. 7
    Hogarth RM, Lejarraga T, Soyer E (2015). The two settings of kind and wicked learning environments. Current Directions in Psychological Science 24:379-385.
    Defines kind and wicked learning environments.
  8. 8
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