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Age structure: The composition of a population in terms of the proportions of individuals of different ages; represented as a bar graph with younger ages at the bottom and males and females on either side.

Age-structure diagrams show the age and gender groups in a population. This allows demographers to predict the future population growth by determining the percentage of the female population. Since females are able to reproduce, demographers can predict the birth rate in the future.

The age structure of a population refers to the proportionate numbers of people in different age categories in a given population for a defined time. It is a natural characteristic of a population in a country or a region. The age structure is closely related to the birth rate, death rate and migration of a population.

Population pyramids are graphical representations of the age and sex of a population. For this reason, population pyramids are also referred to as age-sex pyramids. There are three types of population pyramids: Expansive, Constrictive, and Stationary.

They can be: stable: patterns of birth and death are unchanging over time. stationary: both low birth and death rates (they slope gently inward and have a rounded top) expansive: slope dramatically inward and upward from the base, indicating that a population has both high birth and death rates.

The three age groups are as follows: Pre-reproductive or the juvenile age group. Post-reproductive age group or the old age group. Reproductive age group, which is also referred to as an adult group.

It is common in demography to split the population into three broad age groups: children and young adolescents (under 15 years old) the working-age population (15-64 years) and. the elderly population (65 years and older)