This chapter examines the ways migration shapes men migrants' adulthood transitions, their performance of masculinities during migration and upon their return, and their narratives of adult male identity. The chapter documents the socially constructed nature of adulthood and provides evidence on the ambivalences and ambiguities that men migrants experience regarding adulthood and manhood as a result of their long-term migration. Tensions involving the duration of stays abroad after migration-12 years, on average-on the one hand, and the difficulties in settling down and establishing unequivocal benchmarks of manly adulthood while living in different cultural and structural contexts, on the other hand, result in unsettling migrants' prior beliefs and goals concerning age and gender identities.This study uses qualitative research encompassing life-story interviews with 12 Romanian men in their early and middle adult years who have lived, on average, more than a decade in different European countries,