This introductory chapter explains the reasons for this edited collection, and its goals. Diversity is under-addressed in social gerontology and the aim of this book is to contribute to redressing this. The theoretical framework on which the collection, and each of its chapters, is based is that of Nancy Fraser’s model of justice, which comprises resource (distribution), recognition (social status and cultural worth) and representation (political voice, participation and community involvement). We use an expanded model of resources, beyond the economic (which is what Fraser had in mind), to also think about health and well-being; the affective resources of love, care and support; and housing, health and social care provision. After outlining each of the 21 other chapters in this collection, I go on to consider intersections and interconnections, and the merits of applying a social justice framework to ageing, diversity and (in)equality.