Ageism, or age discrimination is stereotyping and discriminating against individuals or groups because of their age. It is a set of beliefs, attitudes, norms, and values used to justify age based prejudice, discrimination, and subordination. 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 older people The term has also been used to describe prejudice and discrimination against adolescents and ren, including ignoring their ideas because they are too young, or assuming that they should behave in certain ways because of their age.