What is meaning of Age Structure of population describe in brief four main characteristis of age structure of the World population.

Explanation

Age structure represents the number of people of diterent age groups. This is an important indieator population in positions composition.
Following are the four characteristics of age structure of age composition of the world population.
(i) Population composition: The age group 0-15 is called young population , 15-59 age group of working represents an ageing population which require more expenditure on health care facitilities.
(ii) Age-Sex Pyramid: The age-sex structure of the population refers to the number of females and males in different age-groups.
(iii) Expanding population : Nigeria, Bangladesh, Mexico, India and other developing and under developed countries of the world is having the characteristics or expanding population which have triangular shaped pyramid with a wide box. These have larger population in lower age groups due to high birth rate.
(iv) (iv) constant population: The developed countries like Australia, has age-sex pyramid of bell shaped and tapered towards the top. It shows birth and death rates are almost equal leading to a near constant population.