The Defining Decade explores why the years between twenty and thirty are crucial for shaping the rest of adult life. Drawing on her experience as a clinical psychologist, Meg Jay challenges the idea that the twenties are a time to drift or delay important life decisions.
Through real-life case studies and psychological research, the book examines key areas such as career development, relationships, identity, and brain development. Jay argues that choices made during this decade have long-term consequences, and she offers practical guidance on how to make the most of this formative stage of life.