[Abstract] The present work is placed within the realm of Sociology of Education and related Third Age Policies. The sociological investigation of the birth of the Universities of the Third Age, within the specific framework of the education of the elderly, involves the investigation of pro- blematic of the concept of Third Age itself, taking into account that this problematic trans- lates into a rupture with the concept of elderly and the way is dealt with as well as other dependant concepts such as old age and third age. Therefore, we find relevant and funda- mental to research the sociological problematic of this concept by studying different authors. Authors such as Fernandes (1997), Guillemard (1980, 1986) and Lenoir (1979) will be studied as they analysed specifically the social proces- ses that gave rise to the birth of the Third Age concept, in particular the transition process from an invisible old age to an identified old age, from which new and specific social poli- cies were born along with their different views on management of old age.