Japan’s ageing lead: how the generations changed

In 1960, fewer than six in every hundred people in Japan were 65 or older. By 2025, the figure was almost 30 in every hundred. In a group of ten countries across several regions, Japan moved from the middle of the pack to the highest share.

That journey is not a straight line shared by every country. Annual population estimates trace a striking range of demographic paths — and a change with implications far beyond a chart.

From fifth to first

In 1960, France and Germany each had an older population share of roughly 11.5%, about twice Japan’s 5.7%. Italy and the United States also stood ahead. Japan passed France in 1997 and Italy in 2003. By 2025, its share had climbed to 30.0%, compared with Italy’s 25.1% and Germany’s 23.7%.

The comparison shows a share of each country’s population, not a count of older people. Nor does it claim Japan has the world’s highest share: this chart follows a fixed selection of ten countries, chosen to show different paths across regions.

South Korea’s swift rise

South Korea began the series at 3.1%. Its share passed that of the United States in 2021 and reached 20.3% by 2025, compared with 18.4% in the United States. China reached 14.9%, Brazil 11.5%, and India 7.4%.

The World Bank has highlighted how quickly the transition to an older age structure can occur in some countries. A changing age structure can affect the needs of communities and public services, although these numbers alone cannot tell us how any individual country will respond.

Different generations, different timelines

Nigeria’s estimated share was 3.1% in 2025. Japan’s was nearly ten times as large in this selected comparison. That gap is a reminder that ageing is not one single story unfolding everywhere at the same pace.

Every percentage represents a distribution of people, not a verdict on a society. What changes over these decades is the shape of the population each country is preparing for.