The Thesaurus of Aging Terminology is a controlled vocabulary of subject terms used to index journal articles, books, book chapters, videos, and dissertations cited in the AgeLine Database. AgeLine is an online, bibliographic database produced by AARP (formerly the American Association of Retired Persons) that focuses on the subject of aging and middle-aged and older adults, particularly addressing the social, psychological, iconomic, policy, and health care aspects of aging.