Income vs life expectancy: health converged far faster than wealth

Key takeaways

In 1960 a child born in China could expect 33.4 years of life against 69.8 in the United States, a gap of 36 years. By 2024 the gap was 0.9 years, while American income per person remained 6.5 times higher. Long life stopped being something only rich countries could afford.
Nine of the ten countries on this chart now have life expectancy within eight years of the United States. Their incomes per person span a 74-fold range. Health converged; wealth mostly did not.
Nigeria is the exception that shows the stakes: its life expectancy reached only 54.6 years, and its income gap with the United States widened from 32-fold in 1960 to 74-fold in 2025.

What's happening

The chart plays 64 years of two measures for ten countries: GDP per capita across the bottom, life expectancy at birth up the side, each bubble sized by population. Every bubble moves up and to the right over time, but not at the same pace. The vertical motion, health, is where the world converged: China gained 44.6 years of life expectancy, India 26.6, Indonesia 24.5, Bangladesh 30.9.

The horizontal motion is more uneven. South Korea crossed the whole chart, from $159 per person in 1960 to $36,227 in 2025 in nominal terms, and its 83.6 years of life expectancy now nearly match Japan's. India's income gap with the United States barely moved: 35-fold in 1960, 33-fold in 2025. Its life expectancy gap closed from 24 years to 7.

0.9 yrs

The life expectancy gap between the United States (78.9 years) and China (78.0) in 2024. In 1960 the gap was 36.4 years. Over the same period American income per person went from 33 times China's to 6.5 times.

What money buys, and where it stops

The chart's left-to-right slope says income and life expectancy rise together, and for poor countries the relationship is steep: the difference between $1,000 and $5,000 per person is measured in decades of life. At the top the slope flattens. The United States, at $90,027 per person, has the highest income on the chart and lives five years shorter than Japan, which earns 40 percent as much per person. Past a threshold, more income stops buying more years.

The practical reading is that most of the health transition does not wait for wealth. Bangladesh reaches 74.9 years on $2,597 per person, a longer life than the United States average in 1960. Vaccines, antibiotics, clean water, and public health knowledge crossed borders far faster than industrial economies did.

What the moving chart shows

Run the replay and the sequence is plain. In 1960 the chart has two clusters: a rich corner living near 70, and a poor cluster living in the 30s to 50s. China enters at the very bottom: 33.4 years in 1960, in the last year of its famine, below even Nigeria's 37.2. Then the poor cluster starts climbing, decades before it starts moving right. By 1990 China had reached 68 years, Indonesia 63, India 59, and Bangladesh 56, all on less than $600 per person. The rightward income motion comes later and reaches fewer countries: South Korea fully, China partly, India and Bangladesh barely, Nigeria not yet.

What to watch

Two bubbles carry the open questions. China sits at 78.0 years on $13,862 of income: whether it can join the rich corner's incomes matters more to the world economy than any other single movement on this chart, and its dollar economy has lost ground to the United States since 2021. And Nigeria, the largest African country at 238 million people, is where the health convergence has furthest to run: 54.6 years in 2024 is where India stood in the early 1980s.

Common questions

Does higher income mean longer life?

Broadly yes, but the relationship weakens as income rises. On this chart the United States has the highest income per person at $90,027 and lives 78.9 years, while Japan lives 84.0 on $35,951. At low incomes the link is much stronger: Nigeria, at $1,224 per person, has a life expectancy of 54.6 years.

Which country gained the most life expectancy since 1960?

Of the ten shown, China: from 33.4 years in 1960 to 78.0 in 2024, a gain of 44.6 years. Bangladesh gained 30.9 years and India 26.6.

How does China's life expectancy compare to the United States?

China reached 78.0 years in 2024 against 78.9 in the United States, a gap of 0.9 years. In 1960 the gap was 36.4 years. China's income per person is $13,862 against $90,027 in the United States.

Why is United States life expectancy lower than Japan's?

The chart shows the gap but not the cause: 78.9 years against 84.0 in 2024, even though American income per person is about 2.5 times higher. The United States has trailed the other rich countries on this chart for decades despite the income lead.

Data: GDP per capita in current US dollars (through 2025), life expectancy at birth (through 2024), and total population (through 2025) for ten countries, from the World Bank series published in the Kitegraph library. The replay ends at 2024, the last year all three measures exist. Income figures are nominal, so multiples across decades (South Korea's 228-fold rise) reflect inflation and exchange rates as well as real growth. Gaps and ratios are computed from the annual series.