The Dependency Ratio: How Many Workers Support Everyone Else

By the populationclock.org team · Published October 8, 2026 · All figures: UN World Population Prospects 2024, medium variant

The short answer

The dependency ratio counts the people a working-age population has to carry. By the standard definition, dependents are everyone under 15 plus everyone 65 and over, workers are everyone from 15 to 64. Sum the age bands of all 237 countries and territories in the dataset and the world figure for 2024 is about 53.7 dependents per 100 people of working age, rising to roughly 58.0 by 2050 and 67.9 by 2100.

A rise of some 14.2 points over three quarters of a century sounds mild, and it hides the actual event. Split the ratio in two and the halves move in opposite directions. Children per 100 workers fall from about 38.0 to 27.7; people 65 and over rise from about 15.7 to 40.2. Put the way people usually mean it, the world has about 6.4 working-age adults per person over 65 in 2024, 3.9 in 2050, and 2.5 in 2100.

One ratio, two different problems

This is why the single number misleads. A country can be heavily burdened because it is full of children or because it is full of retirees, and almost nothing the two situations imply is the same. Child dependency is self-liquidating: those dependents become the workers. Old-age dependency is permanent in the sense that matters, because the cohort only grows.

The world is still, just, a child-dependency planet, with about 2.02 billion people under 15 in 2024 against 833 million aged 65 or over. By 2100 that is 1.68 billion children against 2.44 billion older people. The country count says it sharply: 61 of the 237 countries and territories already hold more people over 65 than under 15, about 16% of the world, and by 2100 it is 180 of them and 59% of everyone alive.

Where the load is heaviest today

Japan carries about 50.7 people aged 65 or over per 100 of working age in 2024, the highest of the 127 countries above 5 million people and 3rd of all 237, behind only two micro-states, the larger holding about 39 thousand people. As a support ratio that is roughly 2.0 working-age adults per person over 65; its country page has the age breakdown.

Below Japan the list is entirely European: Portugal, Finland, Italy, Greece and Germany follow, from about 39.1 down to 36.9. As a region, Europe carries about 32.0 older dependents per 100 workers against 6.4 in Africa. The lightest national load anywhere is Qatar, at about 2.0 per 100.

The reversal nobody schedules

The countries with the lightest load today are not the ones that stay light. Among countries above 5 million people, the lowest total ratios in 2024 belong to the United Arab Emirates, Singapore, Saudi Arabia and Oman, from about 21.8 to 37.7 dependents per 100 workers. A low ratio is the demographic dividend economists talk about. It is also, mechanically, a warning: a working-age bulge is a cohort that will retire together.

The steepest deterioration to 2050 among those larger countries runs Hong Kong, South Korea, Taiwan, Spain and Italy. Hong Kong moves from about 33.9 older dependents per 100 workers to 96.5 in 26 years, roughly 3.6 times Europe’s own swing over the same stretch. Most of that list is East Asian: the arithmetic underneath the region’s population decline.

China is the case with global consequences, because of its size: about 4.7 working-age adults per person over 65 in 2024, roughly 1.9 in 2050, and about 1.0 in 2100, one worker per retiree. Its working-age population falls from about 984 million to 293 million. India, at about 9.5 today, is a few decades behind on the same road, reaching about 1.9 by 2100.

The countries going the other way

All of the five heaviest total ratios in 2024 among countries above 5 million people are African, led by the Central African Republic, Niger and Somalia, and every one is a child burden rather than a retiree one. Those are also the ratios that improve: 65 of the 237 countries and territories, 44 of them African, carry a lighter total load in 2100 than in 2024. Nigeria moves from about 78.8 dependents per 100 workers to 48.4, the 2nd lightest load of the 127 larger countries by 2100; Africa as a whole goes from about 74.7 to 54.9.

The absolute numbers are the striking part. Nigeria’s working-age population grows from about 130 million to 321 million, more working-age people in 2100 than China: the labour-force side of the African century. Globally, working-age numbers still grow, from about 5.31 billion in 2024 to 6.12 billion in 2050, easing to 6.06 billion by 2100. What changes is not that workers disappear but that people over 65 rise from about 833 million to 2.44 billion, some 2.9 times as many.

The American middle path

The United States sits in an unusual place: about 27.7 older dependents per 100 workers in 2024, 28th heaviest of the 127 larger countries, then 37.9 by 2050 and 49.7 by 2100. Its rise to 2050 is about 10.2 points against Europe’s 17.6, and American working-age numbers actually rise across the century, from about 224 million to 241 million. American fertility is below replacement, so the cushion comes not from births but from migration, which adds people disproportionately at working ages and is the least certain assumption in the projection, as how the United States keeps growing sets out.

What the ratio does not measure

It does not measure employment. The ages 15 and 65 are conventions, not observed behaviour: most 15-year-olds in richer countries are in school and plenty of people over 65 work, while in poorer countries both groups are likelier to be earning. That is why a low ratio is an opportunity rather than an outcome. Several of the lightest ratios also belong to Gulf states whose working-age share is inflated by labour migration, so the figure describes who is present.

Two caveats on precision: these ratios come from five-year age bands for 2024, 2050 and 2100, so band totals differ slightly from the population figures elsewhere on the site, and 2024 rather than the current year is the base for anything called today. Our methodology has the detail. The direction is not much in doubt, though. Today 26 of these 237 countries and territories have fewer than three working-age adults per person over 65, about 5% of the world’s people; by 2100 it is 168 of them and 55% of everyone alive. This is the same arithmetic as rising median ages, seen from the side that asks who pays.

Frequently asked questions

All figures are the UN World Population Prospects 2024 medium variant. World and regional values are computed from summed age bands rather than as averages of national ratios. A projection is a conditional statement about what follows from a set of assumptions, not a forecast.