Research on age in geography has become highly compartmentalized into separate literatures on younger and older generations that rarely intersect. As such, the geographies of intergenerational relationships – and particularly, extrafamilial intergenerational relationships – remain substantially under-researched. This essay reviews how geographers have approached issues of intergenerational relationships while also drawing on recent work from other fields (including sociology, anthropology and queer theory) that can extend current thinking on the geographies of intergenerationality and age relations. How does space facilitate and limit intergenerational contact and relationships? How do the geographies of intergenerational relationships vary between social groups and contexts? And if generational separation and segregation are problems (as a substantial body of work suggests), how can this be ameliorated? Throughout the essay, I examine how social scientists have attempted to address these questions while also identifying the significant gaps that remain in our understanding.