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Ageism, also spelled agism, is stereotyping and/or discrimination against individuals or groups on the basis of their age. This may be casual or systematic. The term was coined in 1969 by Robert Neil Butler to describe discrimination against seniors, and patterned on sexism and racism. Butler defined "ageism" as a combination of three connected elements. Among them were prejudicial attitudes towards older people, old age, and the aging process; discriminatory practices against older people; and institutional practices and policies that perpetuate stereotypes about elderly people.

While the term is also used in regards to prejudice and discrimination against adolescents and children, such as denying them certain rights (e.g. voting), ignoring their ideas because they are considered "too young", or assuming that they should behave in certain ways because of their age, the term is predominantly used in relation to the treatment of older people. Older people themselves can be deeply ageist, having internalized a lifetime of negative stereotypes about aging. Fear of death and fear of disability and dependence are major causes of ageism; avoiding, segregating, and rejecting older people are coping mechanisms that allow people to avoid thinking about their own mortality.

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