The U.S. Census bureau just confirmed what many Gen X'ers and older have been thinking: millennials are still not adults, at least when it comes to hitting their adult milestones.

The bureau released new data this week that show that 30-year-olds now have not done the things that their counterparts did in 1975.

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Specifically, the Census said that in 1975, 90 percent of people who had hit 30 were already living on their own. In 2015, that number dropped to 70 percent.

Just over half of respondents have been married, 57 percent now, compared to 89 percent in the '70s.

And many millennials are still living with their parents, 1 in 3, according to Market Watch.

But why are they delaying moving from post-teenage living to adulthood?

More than half are blaming student loans, Bankrate.com found.

Some are also still learning, still enrolled in school, Market Watch found. About 8 percent of the millennial population are still cracking the books in their 30s.

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In this file photo from October 2024, Atlanta Braves outfielder Jorge Soler and teammates react after losing to the San Diego Padres 5-4 in San Diego. The Braves and Soler, who now plays for the Los Angeles Angels, face a lawsuit by a fan injured at a 2021 World Series game at Truist Park in Atlanta. (Jason Getz/AJC)

Credit: Jason.Getz@ajc.com