This article presents the results of a study on the configuration of social networks of widowed people aged 60 and more in the Metropolitan Region of Santiago, Chile. This work emphasizes the conjunction between the structuring field of aging and the life experiences of older people. Through a research focused on the aging processes in Chile, using social network analysis, the morphology of the networks and the types of links of older people before and after becoming widowed are observed, as well as the way they affect the social construction of aging. More precisely, the latter refers as the identity of the older individual is constructed and re-constructed when the dead of the spouse has the meaning of a life transition. Social relationships, their formation, experiences, and meaning are the axis to the analysis and comprehension of the social phenomenon of widowhood in later life.