What is age composition? How does it affect the population’s social and economic structure?

The age composition of a population refers to the number of people in different age groups in a country.
(i) It is one of the most basic characteristics of population.
(ii) To an important degree, a person’s age influences what he needs, buys, does and his capacity to perform.
(iii) Consequently, the number and percentage of a population found within the children, working age and aged groups are notable determinants of the population’s social and economic structure.