Boomer here: at 25, I was living in a group house with three other men. I strongly suspect that men of 25 working at dead-end white collar jobs can still afford to share a group house.
There seems to be a belief among some on HN that the prior generations went from college to law school to partnership track in a white-shoe law firm. Some did, and a knew a couple of them. Most of us didn't.
Duh? 25 year olds today cannot afford the house their parents had at 25.