For Age Structure we have terms and definitions in 4 topics. The topics are Aging, Hunting, Sociology and World Fact Book.

Distribution of people across various age cohorts
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the number of individuals of each age within the population.
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The relative proportions of different age categories in a population.
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This entry provides the distribution of the population according to age. Information is included by sex and age group (0-14 years, 15-64 years, 65 years and over). The age structure of a population affects a nation's key socioeconomic issues. Countries with young populations (high percentage under age 15) need to invest more in schools, while countries with older populations (high percentage ages 65 and over) need to invest more in the health sector. The age structure can also be used to help predict potential political issues. For example, the rapid growth of a young adult population unable to find employment can lead to unrest.
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