The aim of this paper is to review the social constructionist view of age and ageing that emerged in the late 1970s and early 1980s. It begins with a general consideration of social constructionism as an epistemological framing of the world, before turning to its use in social gerontology. It considers two distinct social constructionist approaches treating later life as a social reality: (a) as a structural consequence of the rise of the modern state and its organisation of the labour market and (b) as a consequence of shifting cultural and social representations. Arguing that the earlier more structuralist accounts have gradually become overshadowed by concerns over age as identity, socially constructivist approaches now place as much emphasis upon the social representation of age as on its social-structural organisation. The paper then reviews the costs and benefits of social constructionism in general and its becoming a key part in the study of ageing. Its benefits arise from drawing attention to the salience of the cultural and the social in fashioning age and ageing and thereby advancing the sociology of later life. At the same time, social constructionist approaches to old age risk neglecting an other personal and social reality arising from corporeal decline and fear of the body-to-come. The paper concludes by noting how, whether approaching ageing and old age as natural kinds or as human kinds, adopting biological or sociological methodologies, all such methods privilege the externality of age – whether as a social or a biological fact. What is not captured by either is the problematic internality of age. What might be called the subjectivity of age will remain a topic for cultural representation, beyond the methods of both biological and social science.