The chapter examines the paths through which young activists have approached politics. In most cases, these paths begin in adolescence, mainly within student collectives, but, in other cases, initiation occurs later, in university collectives or directly in groups and movements external to the educational environment. For some activists the first contact arises from a political interest, for others it is linked to social and cultural interests. For some, the first group is still the one they refer to, others moved through multiple contexts of participation: these transitions are described as fluid, and linked to the search for a context that responds to the different personal, not only political, reasons for participation. Naturally, the approach to political activism is also influenced by opportunities from living environments. School can play an important role through the presence of politically sensitive teachers or classmates. Friends outside school are often sources of both stimuli and proposals for engagement. Family can both transmit values and sensitivities, or even—more rarely—forms of participation. But even a family or school context that is adverse to youth political sensitivities can have a significant impact, pushing young people to deepen and cultivate them autonomously.