More adults ages 35 or older are packing up their households and bunking with in-laws, siblings, parents or other kin. It’s happening at a historically high rate, according to new Census Bureau estimates. Nearly 500,000 such folks moved in with family over the past two years, compared with some 400,000 in the 25-to-34 age group traditionally known for returning to live with parents. Together, the two groups drove an 11.4 percent increase in the number of U.S. households containing extended families.

Indeed, the downturn has pushed more people of all ages to cohabit. The total number of multifamily households, including nonrelated roommates, has risen 11.6 percent — to 15.4 million — since 2008. But the surge’s impact is especially profound among the older adults, accelerating a pattern begun during the 2000 recession: 3.4 million more Americans ages 35 and older have moved in with relatives over the decade. Their numbers increased twice as fast as the age group’s population.

Technically, census data show, taking refuge among family kept nearly 2 million people out of poverty last year. But that estimate doesn’t tell the whole story of how some are suffering.