This article states that nowadays there is an overuse (or a misuse) of the «Generation» idea. The discussion among many authors over the «Generation of crisis» concept suggests that it is useful to outline the characteristics of the target of population of the collective of youth who are mainly affected by the economic and social crisis over the past years. Nevertheless, through analyzing the meanings of the «Generation of Crisis» made by Mannheim, Ortega and other classic authors, it is clear that the social class approach together with the generational one are needed to define this concrete concept. The conclusion of the articleis that both approaches are seen as underpinning their utility to the study of the dynamics of social change (even generational) occurring in the postcrisis society which will also reinforce their impact. Besides, the function of the notion of generation in sociology (particularly in the sociology of youth) is claimed without using it in order to hide conflicts and inequalities (due to other elements of the social fragmentation) that arise in each of the «generations» and, therefore, in the contemporary capitalist societies.