The ACA (Obamacare) extended coverage to age 26 for children because about half of young adults up to age 26 were living with their parents
Since WW2, we've torn down about a million SROs.* We have also largely zoned out of existence the ability to build new Missing Middle housing.
We have a dire shortage of a certain kind of housing: small, inexpensive housing near amenities. This is true nationwide.
* https://en.m.wikipedia.org/wiki/Single_room_occupancy#:~:tex....