[Participatory approaches in age(ing) research : Definitions, fields of application and challenges in different research stages].

There is much to be gained from participatory research: it can increase the closeness of research to everyday life, the acceptance of the resulting practical implications and holds the potential to fundamentally democratize scientific knowledge production. It is not surprising that this is not without irritation on the part of academic researchers and their institutional environment as well as on the part of nonacademically trained co-researchers. Based on an inspection of the relevant literature this article outlines the different understanding and definitions of participatory age(ing) research, its current fields of application, and utilization in different phases of the research process. Subsequently, the challenges that participatory approaches in age(ing) research can pose in these different fields and phases are discussed and possible solutions are outlined.