"Deaths of despair" are also on the rise.

More millennials are also dying "deaths of despair," or deaths related to drugs, alcohol, and suicide, Jamie Ducharme reported for Time in June, citing a report by the public-health groups Trust for America's Health and Well Being Trust.

While these deaths have increased across all ages in the past 10 years, they've increased the most among younger Americans, Ducharme said. They accounted for the deaths of about 36,000 American millennials in 2017 alone, according to the report. Drug overdoses were the most common cause of death.

The report cites a few reasons behind these upticks — young adults are more inclined to engage in risk-taking behaviors, comprise the highest number of enrolled military personnel, and disproportionately live in "high-stress environments" like correctional facilities.

Read more: 'Deaths of despair' are taking more lives of millennial Americans than any other generation