The project “MIG-AGE (Do Immigrants in Europe Aging Well? Mixed Methods and Intervention Study in Four Countries)” supported by The Volkswagen Foundation, addresses the question of what it means for different groups of migrants in Europe to be old and age well, specifically for first-generation retired labor migrants from Italy and Turkey living in Germany and the Netherlands and for retired migrants from Germany and the Netherlands living in Italy and Turkey. By considering these diverse groups of migrants, the project aims to investigate the relationship between individual well-being and personal networks, and the subjective meanings of aging and aging well among older migrants across Europe, with an expected outcome of an in-depth understanding and comparative perspective of migrants aging well. The main expected outcome of the project is an in-depth understanding and a comparative perspective of the macro-level socio-structural determinants of aging well of migrants, the micro-level meanings, and the associated inequalities in Europe.