These are the countries with the largest share of children — and adults — in 2025 Several lists define “youngest population” differently — some by median age (half the population younger than that age ...

The world’s population is ageing at an unprecedented pace, but this trend is far from uniform across different parts of the globe. According to the United Nations’ World Population Prospects 2024 (the ...

Having a young population means a country has a large share of children, teenagers, and young adults relative to older age groups, often reflected in a low median age. This demographic profile can be ...