Fifty-three economies now count more people over 65 than children under 15 — and in 2024 the United States joined them

We compared two age-band population counts — people aged 65 and over, and children aged 0 to 14 — for every economy the World Bank tracks, using its 2024 estimates (series last updated 2026-07-13). All 217 economies report both figures; none are missing. In 53 of the 217, the 65-and-over count is larger than the under-15 count. Forty-five are high-income economies; the other eight are upper-middle-income — Bosnia and Herzegovina, Serbia, Ukraine, Belarus, Cuba, North Macedonia, Thailand and Albania. No low-income or lower-middle-income economy is on the list. Japan has the widest gap of any economy with more than a million people: 36.9 million aged 65-plus against 14.2 million under 15, about 2.6 to 1. Only the microstate of Monaco runs higher (2.7 to 1). Five economies crossed in 2024 — more children than over-65s in 2023, the reverse a year later: Thailand, the United States, Macao SAR, Aruba and Albania. In the United States — the world's third-most-populous economy — the count ran 61.0 million aged 65-plus to 58.9 million under 15 in 2024, having stood at 58.7 million to 59.3 million the year before. The world as a whole has not crossed. Globally, 830.5 million people were 65 or older in 2024 against 2,012.9 million under 15 — roughly 2.4 to 1. The under-15 total peaked in 2020 at 2,028.7 million and has fallen every year since; the 65-plus total rose from 732.9 million to 830.5 million over the same span.

The following is analysis, not fact. The value in reading the whole table, rather than the two or three countries a desk usually names, is the composition of the 53. This is no longer a Japan-and-Italy curiosity. ^mmodeled The list already reaches down the income ladder: eight of the 53 are upper-middle-income, and Thailand — which crossed in the same year as the United States — reached an older-than-young age structure at a fraction of the income per head the European members had when they got there. Demographers call that arriving "old before rich." We did not join an income variable to the crossing dates or model competing predictors; that association is what the panel shows, not a mechanism these counts isolate. ^sspeculative The American crossing is the kind of milestone that passes without a headline, for two reasons the data make plain. First, the margin is a hair — 2.1 million in a country of 340 million, a line the count had been walking toward for a decade as the gap narrowed year on year. Second, the yardstick Americans hear most often draws the child line at 18, not 15: on that broader band the United States has *not* crossed nationally. The Census Bureau's own 2024 estimate puts 65-and-over at 61.2 million against 73.1 million under 18 — close, but not past — and marks the flip in only 11 states so far. The milestone is real and it is also entirely a function of where the line sits: under 15, the country is past it; under 18, it is not. What the time series adds is direction. In each of the five 2024 crossers, the gap had been closing steadily since at least 2010 — a one-way drift, not a wobble around the line. The stock of children a society carries is set years earlier by its births; the over-65 count is set decades earlier still. That both curves point the same way across 53 economies, with none of the 53 reversing year to year, is the reading a single-country vantage cannot see. ^mmodeled

The strongest counter is that the whole result is an artifact of the cut-off. Draw the child line at 18, the standard the U.S. Census Bureau uses, and the United States has not crossed at all — 65-plus trails the under-18 population 61.2 million to 73.1 million nationally, with the flip recorded in only 11 states. The "53 economies" headline is specifically an under-15 finding, and would shrink under a broader band. That is fair, and it is why the band is stated in every figure above rather than buried. A second, legitimate objection: the World Bank counts *economies*, not sovereign states. At least a dozen of the 53 are territories or microstates — Monaco, San Marino, Hong Kong, Macao, Puerto Rico, Aruba, Bermuda, Curaçao, the Isle of Man, the Channel Islands, the U.S. Virgin Islands, Andorra, Liechtenstein. Restrict the set to UN member states and the count is smaller. The 53-of-217 figure is only as broad as the World Bank's own economy list, which is the denominator named here. Third: the crossover is a stock, not a destiny. It reflects a one-time transition from high to low fertility, and the ratios could stabilize rather than run away. Nothing in these counts forecasts where they settle — they are a snapshot of 2024, not a projection.

From Bangkok the crossover is not news framed around a data line but around who pays and who cares for whom. Thai agencies mark the same shift using a 60-and-over cut against the under-15 population and reached it on their own count in 2025, with the government projecting a "super-aged" society by 2036. ^mmodeled The through-line the cross-country table draws — that the milestone is spreading to middle-income Asia and Eastern Europe, not staying in the wealthy West — lands there as a question of pension coverage and care labor arriving at perhaps a third of the income the first-crossing European states could spend on it. ^sspeculative