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Multilingual Demographic Dictionary, second unified edition, English volume
Age groups
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The age distribution of a population is either given by individual years of age 1 or by age groups 2, which may be five-year age groups 3, also called quinquennial age groups 3, or broad age groups 4, such as 0-19 years, 20-59 years, 60 years and over. Occasionally a population’s age distribution 6 or age structure 6 is given by classifying the population by year of birth 5. Graphically an age distribution may be represented by a population pyramid 7 which is a histogram (155-8) showing the population by age and sex and so named because of its typical pyramidal shape. More...