You're right, many millennials aren't adults ... yet

Credit: Brad Barket/Getty Images for 90sFEST

Credit: Brad Barket/Getty Images for 90sFEST

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, 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.

Measuring America: 30-Year-Olds: Then and Now[Source: U.S. Census Bureau]