Although extensive research has been conducted on the evolving patterns of educational assortative mating, the interplay between this phenomenon and partners’ age differences has received limited attention. This study offers a twofold contribution. First, it examines trends in both age and educational assortative mating over 5 decades across four countries. Second, it explores age-difference trends in educationally heterogamous and homogamous couples, with a focus on patterns related to educational homogamy. We used IPUMSi harmonized census microdata for Brazil, France, Panama, and the United States, available since the 1960s. Results indicate a slight increase in the proportion of same-age couples among tertiary-educated couples over time, while proportions across other educational pairings remain stable. Additionally, we observe a growing prevalence of relationships in which the man is much older than the woman, particularly among educationally hypergamous and homogamous low-educated couples. These trends are consistent across all contexts examined.