Feb 06, 2015

Watch the world's age demography dramatically change shape from pyramid to column

Since humans started organizing into communities, the shape of any given society, broken into age groups and gender, has always resembled a pyramid: The largest age group has always been the youngest (0-4), and the oldest group (75+) has always been the smallest, with each age group in between falling in more or less a straight line, forming a triangle. But starting in 1975, The Economist...

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