Discrimination is the process of making unfair or prejudicial distinctions between people based on the groups, classes, or other categories to which they belong or are perceived to belong, such as race, gender, age, religion, physical attractiveness or sexual orientation. Discrimination typically leads to groups being unfairly treated on the basis of perceived statuses based on ethnic, racial, gender or religious categories. It involves depriving members of one group of opportunities or privileges that are available to members of another group.

Ageism is a bias against, discrimination towards, or bullying of individuals and groups on the basis of their age. The term was coined in 1969 by Robert Neil Butler to describe discrimination against the elderly, patterned on the terminology of sexism and racism. Butler defined ageism as a combination of three connected elements: negative attitudes towards old age and the aging process, discriminatory practices against older people, and institutional practices and policies that perpetuate stereotypes about elderly people.