This study explored the role of social capital for non-institutionalised and institutionalised political participation among older adults compared to younger age groups using European Quality of Life Survey data (EQLS) from 2016 and 33 countries (n = 36,908). Multilevel logistic regression analysis was employed to assess the association between individual- and country-level social capital and political participation. Findings revealed that, at the individual level, active associational engagement was positively related to both forms of political participation, while social trust and political trust were linked only to non-institutionalised participation—higher social trust and lower political trust were associated with a greater likelihood of participation. Country-level associational engagement was related to non-institutionalised political participation and country-level political trust with institutionalised participation. For older adults, active associational engagement had stronger individual and contextual effects on non-institutionalised political participation. These results enrich our understanding of political engagement in later life and highlight the unexplored potential for civic involvement among older adults.