The rise and fall of marriage propensities by education are mainly driven by delayed and increased union formation among the better educated. As can be seen in the panels for both men and women in Appendix 2, gains in marriage propensities (i.e., differences between 2000 and 2010 observed marriage propensities by education) for the better educated (i.e., particularly m4-f4 and m3-f4 pairings) in 2010 are clustered in unions formed in the thirties and early forties.