Background. Most countries in the world are experiencing an expansion in their population of older people. As people now expect to live longer, they also seek continuing health and well-being throughout their extended old age. Occupational therapists are involved in working towards the attainment of well-being with their older clients. However, their understandings of what well-being for older people entails seems varied, as this examination of the occupational therapy and related gerontological literature reveals. Results. Three key points emerge from the literature review: first, the definition of well-being is usually assumed, or is lacking in clarity, and a range of similar terms, such as happiness and life satisfaction, are used interchangeably; second, well-being has been measured in research using various scales, which may not capture the complexity of the concept; and third, the perspective of the older person is often missing in discussions of well-being. Clinical Implications. It is suggested that one way of moving occupational therapists' understanding of well-being forward is to conduct research into what older people themselves understand or perceive well-being to be.