Mostly millennials and GenX. It's easy to blame boomers but they aren't the ones buying most of the houses.
Edit: looks like this hit close to home with the "muh boomers are the root cause of all evil" crowd. This is your reminder that the youngest boomers are now 60 years old. You're also out of your mind if you think homeowners aged 35 to 59 wouldn't scream bloody murder if the government somehow managed to suppress home prices.