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Sociology

Demographic Transitions and the Changing Shape of the Global Population Pyramid

Quick fact

Japan’s population pyramid in 2023 is top-heavy with a median age of about 49, while Niger’s is a classic pyramid with a median age of only 15. This contrast reflects different stages of demographic transition.

Why this is interesting

You've probably seen a population pyramid: a triangle-shaped graph that shows a country's ages. But have you ever wondered why some pyramids are wide at the bottom and others are almost rectangular?

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Demographic Transitions and the Changing Shape of the Global Population Pyramid

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