[Three psychosociological approaches of ageing. Identity, social categorization and social representations].

According to social psychology, the relationship between the subject and his environment is constantly mediatized by the interaction with others. This article presents a set of researches on ageing which adopt this epistemological approach. A first part is dedicated to studies which focus on the identity of the old subjects. The second part presents works that are devoted to social categorization of the aged. Finally, the third part is dedicated to researches on social representations of the aged. With no claim to exhaustiveness, this paper underlines the interest of a psychosocial approach of aging.