Adulthood has a history. In this post, Maria Cannon and Laura Tisdall introduce their new edited collection, 'Adulthood in Britain and the United States from 1350 to Generation Z', which explores how concepts of adulthood have changed over time in Britain and the United States. Expectations for adults have altered over time, just as other age-categories such as childhood, adolescence and old age have been shaped by their cultural and social context. Collectively, the volume's authors consider four key ideas: adulthood as both burden and benefit; adulthood as a relational category; collective versus individual definitions of adulthood; and adulthood as a static definition. 'Adulthood in Britain and the United States from 1350 to Generation Z' (November 2024) is the 20th volume in the Society's New Historical Perspectives series published by the University of London Press.