Working-Age Share
The share of the world's population aged 15–64 — the conventional 'working-age' band — peaked at about 65% around 2015 and is now declining. Advanced economies passed this peak in the 1990s; major emerging markets are passing it now. Most of the global headwind to GDP-per-capita growth over the next 30 years comes from this inversion, not from technology or productivity changes.
Key insights
The 'demographic dividend' window opens and closes
When fertility falls and child mortality declines, child-dependency drops faster than old-age dependency rises. The result is a 20–40 year window when working-age share grows — the 'demographic dividend'. Many East Asian economies converted this window into industrialisation-led growth (Korea, Taiwan, Singapore 1970s–2000s; China 1990–2015). Sub-Saharan Africa is at the early stage of its window; most of South Asia is mid-window.
Japan is the canary
Japan's working-age share peaked at 70% in 1992 and is now 58% — losing ~10pp in 30 years. The labour force has shrunk in absolute terms despite high female and elderly participation gains. Growth in GDP per capita has held up, but total GDP has been roughly flat for 25 years. Korea, Italy, Germany and (with a long lag) China are now on similar trajectories. The demographic-dividend literature has shifted to studying its end.
The age structure question is asymmetric
Countries entering the demographic dividend (most of sub-Saharan Africa, parts of Middle East and South Asia) get a one-time boost they can capture only if institutions deliver jobs and education. Countries leaving the dividend face mechanical headwinds even if everything else is well-managed. The cumulative arithmetic — half the world in each camp by 2050 — implies divergent macroeconomic paths irrespective of policy.
Share of population aged 15–64 — world (1960–2050)
% of total population
Key Finding: Peaked around 2015 at 65%; projected to fall to ~57% by 2050.
Working-age population share — major economies (2024)
% aged 15-64
Key Finding: Sub-Saharan African countries (~52%) and Japan (~58%) sit at opposite ends — for opposite reasons.
Methodology & caveats
The 15–64 convention
The '15–64 working age' convention is a statistical convenience, not an empirical fact about who works. School attendance is universal in many countries through age 18+; retirement ages are now 65–67 and rising; labour-force participation among under-25s has fallen in advanced economies. Refined working-age measures use country-specific labour-force participation by age; aggregate trends are similar.
Dependency ratios
Total dependency ratio = (under 15 + 65+) / 15–64. Child dependency falls during demographic transition; old-age dependency rises. The combined ratio is U-shaped — falling, then rising. The minimum is the 'sweet spot' of the demographic dividend. Japan's total dependency ratio bottomed at 0.43 in 1990; it is 0.71 today and projected to reach 0.94 by 2050.
Productivity offsets demography, partially
Aging reduces labour-force growth and lifts dependency ratios. It can be offset by: (a) higher participation rates (women, elderly), (b) higher productivity, (c) immigration. Japan has done (a) and (b) heavily; not (c). Continental Europe has done some of all three. Korea is doing mostly (b). No country has offset aging without an explicit demographic-policy choice.