Ageism is the prejudice and discrimination based on a person’s age.
Definition Two:
Ageism is the relative proportions of different age-sex categories in a population. Often depicted in a graph, the age-sex structure of a society displays the proportion of males to females in each succeeding age category. Beginning with the youngest ages on the bottom and displaying a bar graph of the number of males to the right and females to the left of the center, the graph shows both the relative numbers of males to females in each age category as well as the total proportion of the population in each designated age category. The age-sex structure of societies vary significantly depending on their level of development.