Age-heterogamous partnerships: Prevalence and partner differences by marital status and gender composition

OBJECTIVEWe examine age heterogamy in the United States and its associations with other partnership characteristics following the nationwide legalization of same-sex marriage in 2015. METHODSWe use American Community Survey data for 2017-2021 to examine age gaps in over 3.3 million couples, differentiating by couple gender composition (man-man, manwoman, woman-woman) and marital status (cohabiting, married).We estimate the prevalence of age heterogamy and how it correlates with education, income, and race/ethnicity differences between partners. RESULTSThe prevalence of age heterogamy and its associations with other partner differences vary by couple gender composition and marital status.Man-man couples have higher rates of age heterogamy than man-woman and woman-woman couples; over three in ten manman couples had age gaps of at least eight years between partners, with no difference by marital status.Age heterogamy was less common among married than cohabiting manwoman couples.For most couple types, educational and income differences between partners were more common among age-heterogamous partnerships.The prevalence of interracial/interethnic partnerships was higher among age-heterogamous married manman and man-woman couples but not for woman-woman couples.