BY Team Aakash Byju's
The age pyramid is also known as the age-sex pyramid. The age pyramid was first established in the U.S.A in 1874 for a population with a high birth and death rate.
The expansive pyramid shows a larger number of percentages of the population in the younger age groups, usually with each age group smaller in size or proportion than the one born before it.
A pyramid is called stationary when the share of the population remains constant in different age groups over a period of time.
It is used to visualize the particular population in an area and determine the overall age distribution of the population.