This study provides strong evidence that a father’s level of education has a measurable impact on his children’s longevity. Using a family fixed-effects approach that compares cousins within the same extended family, the analysis isolates the effect of paternal education on old-age mortality. Children of college-educated fathers lived, on average, 4.6 months longer than those whose fathers had less education—nearly three-quarters of the average gender gap in life expectancy. These findings reinforce the importance of educational attainment not only for individuals but across generations.