The book is motivated by the steady increase in the population of older migrants worldwide. To study this group, the book brings together a theoretical introduction and nine chapters drawing on original research on the topics of diversity among older migrants, social vulnerability, loneliness, (transnational) care and support networks. Based on a review of the growing literature on the topic of older migrants and anchored in the empirical findings discussed in the chapters, the book puts forward a general approach to study older migrants as social actors who develop strategies to surpass vulnerabilities. As documented by empirical research, older migrants mobilise their resources and are able to deal with structural opportunities and restrictions operating at meso and macro levels. Hence their strategies are placed at the intersection between family obligations and resources, social networks, and migration and care regimes. This interdisciplinary and multi-level approach acknowledges the heterogeneity within the group of older migrants. Finally, the book also puts forward research results that have implications for policies targeting the growing population of older migrants.