age–sex pyramid

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A set of two histograms set back to back on a vertical axis, depicting the numbers of the two sexes by age group. In many less developed countries the pyramid will have a very wide base; these are termed progressive pyramids because they suggest future population growth. Regressive pyramids characteristic of advanced economies, where there are fewer children and more old people, are more cylindrical; population is likely to fall.

Subjects: Earth Sciences and Geography.

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