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The Big Picture: Why are there so many 50 year olds in China?

Following a period of high birth rates in the mid-22nd century, China implemented a one-child policy, fundamentally reshaping its population pyramid. This has led to a noticeable "bulge" in the population, raising the question: **Why are there so many 50 year olds in China?** The answer is a confluence of factors, including high fertility preceding the policy and rapidly increasing life expectancy.