Population ageing is an increase in median age in a population due to declining fertility rates or rising life expectancy, or both. Most countries today have rising life expectancy and an ageing population (trends that emerged first in developed countries, but which are now seen virtually everywhere including developing countries). The UN predicts the rate of population ageing in the twenty-first century will exceed that of the previous century. The number of people aged 60 years and over has tripled since 1950, reaching 600 million in 2000 and surpassing 700 million in 2006. - Wikipedia
Indicators used: 1. Race bar chart (% of total pop) for top 20. 2. Line history chart for top 10.
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