The world population is changing: For the first time there are more people over 64 than children younger than 5

Countries across the world have been going through an important demographic transition: from young to increasingly ageing populations.

World Population2In 2018 the number of people older than 64 years old surpassed the number of children under 5 years old.

This was the first time in history this was the case.

We can see this transition clearly when we look at the population by age bracket in the chart below — this is shown from 1950 onwards, with UN projections to 2100.

In the chart below you can explore the projected age structure of future populations — for Australia or any other country or world region, just click on Change Country in the bottom left.

Going beyond the global perspective, when did this crossover point occur in countries around the world?

The timing varied significantly between countries – in higher income countries with low fertility rates and longer life expectancies, it has been shifting for decades.

PopulationIn the United States, under-5s were already outnumbered by those older than 64 by 1966.

In Spain it was 1970; in South Korea it was 2000.

For many countries, this crossover point is still to come.

In India, it’s projected to be 2028.

In South Africa, it’s expected to happen in 2036.

In low-income countries with high fertility rates and lower life expectancy this point is still many decades away: it’s projected that in Nigeria, under-5s will outnumber those older than 64 until 2087.

The number of children under 5 years old is projected to peak and plateau for most of the 21st century.

And as the global population of people older than 64 years will continue to grow, it’s clear that we’re moving towards an ageing world.

Guest Expert: Max Roser  is an economist at the University of Oxford and the founder of Our World in Data

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Apart from our regular team of experts, we frequently publish commentary from guest contributors who are authorities in their field.


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