A record number of young Americans can't afford to move out, which is bad for young people and a warning sign for the housing market.

• A record 25 million people under 35 still live with their parents — about one in three.
• Most aren't slackers; around 70% have jobs but still can't afford a place of their own.
• Home prices have jumped more than 34% since before the pandemic, and rents keep climbing too.
• The real cause is inflation making housing unaffordable, and it's expected to get worse.

Outlook: With prices and rents still rising faster than wages, more young people will likely stay stuck at home.