This study examines how parenting styles predict children’s lifetime outcomes. Using a Swedish dataset which combines rich survey information on parenting styles with administrative records tracking children over five decades, we find that authoritarian parenting is negatively associated with children’s long-term success, especially regarding their educational attainment. The results for other parenting styles are more mixed. Authoritarian parenting remains a robust predictor of adverse outcomes even when accounting for ability and family background. We identify children’s knowledge accumulation and parental educational expectations as key mechanisms explaining these results.