Gerontological inquiries into understandings of successful ageing have been culture-specific. This means that they have only been studied in the specific cultural settings that have given them their meaning. Understandings of successful ageing that are simultaneously influenced by two cultures have yet to be studied. This study is based on a newly-designed culturally-relevant theoretical framework for the study of successful ageing, and focuses on the context of migration where culture of origin and host culture meet. Interviews based on vignettes have been conducted with 30 Iranian immigrants in Sweden in order to reveal if, and how, the pre- and post-migration understandings of successful ageing differ. The findings show that cultural contexts determine how the construct in question is understood and that migration between different cultures can challenge these understandings.