America's suburbs are heading for trouble as boomers age out of their big houses, and younger buyers may not get the cheap homes they were hoping for.

• Boomers are 64 million people and most want to stay put, so the flood of homes for sale keeps getting delayed.
• When those houses do hit the market, Wall Street firms like Blackstone plan to buy them and rent them out instead of selling to families.
• Millennials and Gen Z mostly don't want suburban life anyway — fewer kids, less driving, less interest in a house in a cul-de-sac.
• Suburbs are now about 70 years old with crumbling sewers, aging schools, and debts coming due, while senior voters keep voting down the taxes to fix them.
• Japan shows the worst case: 9 million empty homes and whole towns turning into ghost towns as the old generation dies off.

Outlook: Expect more suburban homes shifting from family ownership to corporate rentals, with the weakest towns sliding toward bankruptcy and abandonment.