Recent research has shown that significant life events, such as divorce or childbirth, can profoundly shape political behavior. Many of these events occur early in life and have lasting effects on voter turnout and political engagement, often exacerbating disparities across socioeconomic groups. This paper examines how parental divorce influences voter turnout in adulthood. Using comprehensive Swedish registry data on voter turnout and family backgrounds, we perform a sibling analysis to assess how the age at parental separation affects long-term political engagement. We identify a pronounced age gradient: younger children experience stronger negative impacts on adult voter turnout, with effects visible in early childhood and during their formative years. The effects are especially pronounced among boys and persist even when controlling for factors such as family income, education, and employment. These findings contribute to our understanding of how early-life experiences shape political behavior over the long term.