Which country has the world's oldest population and the highest rate of people over 100?

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Multiple Choice

Which country has the world's oldest population and the highest rate of people over 100?

Explanation:
Think about how populations age. When a country has the oldest population, it means a high average age and a large share of people who are elderly. The rate of people over 100 is a clear sign of extreme longevity within that population. Japan fits this pattern because it has very long life expectancy and, despite a low birth rate, keeps a large proportion of people living into old age, with many reaching 100. The other countries listed have younger age structures overall, with higher birth rates or more recent demographic shifts that keep the average age lower and the share of centenarians smaller. So, the country with the oldest population and the highest rate of people over 100 is Japan.

Think about how populations age. When a country has the oldest population, it means a high average age and a large share of people who are elderly. The rate of people over 100 is a clear sign of extreme longevity within that population. Japan fits this pattern because it has very long life expectancy and, despite a low birth rate, keeps a large proportion of people living into old age, with many reaching 100. The other countries listed have younger age structures overall, with higher birth rates or more recent demographic shifts that keep the average age lower and the share of centenarians smaller. So, the country with the oldest population and the highest rate of people over 100 is Japan.

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