This introduction presents an overview of the key concepts discussed in the subsequent chapters of this book. The book explores a range of social, historical, cultural and political events that current generations of older lesbian, gay and/or bisexual (LGB) people have experienced across their lives. It offers ideas about future developments in LGB ageing research, policy and practice. The book discusses the relation to a number of specific institutional contexts: social care, health and medical services, and local government equality work. It focuses on self and social identities further by turning attention to the intersections of ageing and sexuality in relation to particular places and locations from the body, to the home, to the wider LGBT community. Overall the book aims to consider differences amongst older lesbian, gay and/or bisexual people, disaggregating monolithic conceptions of lesbian, gay and/or bisexual ageing, as well as comparing their lives with those of older heterosexual people.