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Age structure represents the number of people of different age groups. This is an important indicator of population composition, since a large size of population in the age group of 15-59 indicates a large working population.

The age structure is closely related to the birth rate, death rate and migration of a population. In the region with high birth rate, the proportion of children tends to be higher, whereas in the region with low birth and death rate, the percentage of elderly population tends to be higher.

A population's growth rate is strongly influenced by the proportions of individuals of particular ages. With knowledge of this age structure, population growth can be more accurately predicted. Age structure data allow the rate of growth (or decline) to be associated with a population's level of economic development.

Age distribution indicates the composition of a population ing to age or the relationship of individual age groups to one another.

Contrary to a common belief, the principal factor tending to change the age distribution of a population—and, hence, the general shape of the corresponding pyramid—is not the death or mortality rates, but rather the rate of fertility.

age distribution, also called Age Composition, in population studies, the proportionate numbers of persons in successive age categories in a given population. Age distributions differ among countries mainly because of differences in the levels and trends of fertility.

age distribution, also called Age Composition, in population studies, the proportionate numbers of persons in successive age categories in a given population. Age distributions differ among countries mainly because of differences in the levels and trends of fertility.

Age distribution. The frequency of different ages or age groups in a given population. The distribution may refer to either how many or what proportion of the group.