Watch the world's population age

Over the last 50 years, much of the world's population has grown older — and lived longer. Each color below represents one of 28 different countries. Click on the timeline to choose a year first, then hover and/or click on the colored rectangles to see how populations in each have aged over time.

Data Source: The Human Mortality Database

Read the full story on STAT: Humans can only live so long, and we’re nearing the limit, researchers say

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