The National Center for Family & Marriage Research (NCFMR) at the Bowling Green State University just released this family profile. Its findings are based on data from the 2019 American Community Survey (ACS), 1-year estimates. It is interesting to see the median age difference between same-sex and different-sex couples after the legalization of same-sex marriage by the U.S. Supreme Court in 2015. The U.S. Census Bureau has changed their data collection since then to directly query respondents about same-sex and different-sex partnerships. See other family profiles based on ACS data.