All About Adolescence provides a comprehensive and current introduction to all key aspects of adolescent development. Building on the success of The Nature of Adolescence, this book addresses the unprecedented changes affecting young people’s lives, including the social media explosion, artificial intelligence (AI) emergence, pandemic impacts and growing climate emergency awareness. It covers critical contemporary topics including advances in neuroscience and brain development research, evolving discourses around racial and gender identity, mental health and well-being concerns and the lasting effects of Covid-19 on adolescent development. What sets this book apart is the authentic voice of young people themselves. Interviews with individuals aged 14–18 from diverse backgrounds are woven throughout all 11 chapters, providing vivid, real-world insights into what it means to be an adolescent in today’s world. The book emphasizes a positive perspective on adolescence while developing the innovative STAGE theoretical framework, examining how young people actively construct their own developmental pathways through this crucial life transition. From brain development and identity formation to peer relationships and resilience strategies, each chapter combines cutting-edge research with genuine adolescent perspectives. This authoritative text is essential for anyone studying human development at undergraduate and postgraduate levels, as well as professionals including teachers, social workers, health workers, counsellors and youth workers seeking to understand and support young people navigating this complex and formative period.