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Using this form of visualization, several common patterns have been identified: expansive, stationary, and constrictive. The three major age groups are children and adolescents (0-14 years old), working adults (15-64 years old), and older adults (the elderly; >64 years old).

Three broad categories to classify population: Children (under the age of 15): They are economically inactive. Working age(15-64 years):They are the working age population (15–64 years). ... Aged (over 64 years): They may work on a voluntary basis but are not accessible for recruiting.

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.

The three types of population structure are: Expansive (a young population and is growing) Stationary (there is neither increase nor decrease in population) Constrictive (an aging population, decreasing)

They are: Finite Population. Infinite Population. Existent Population. Hypothetical Population.

A population pyramid is a graphical representation of the distribution of people by sex and age group. There are usually three types of age pyramids - The expansive age pyramid, stationary age pyramid, and constructive age pyramid.

There are generally three types of population pyramids created from age-sex distributions-- expansive, constrictive and stationary.

An age structure diagram, or population pyramid, shows the distribution of age and sex in a population. The y-axis of the diagram shows age groups from birth to old age. The x-axis shows the population percentage.