I am early 30s. I realised this about the time I finished university and thought I might be expected to move out. The housing market was already pretty insane.

I got a job that required me to move when I was 25, though, and what I realized after that was that living with your parents constrains you. I don't know how your relationship with your son is, but while I lived with my parents, they expected to know where I was going and be home for dinner, and even if I refused to tell them, I'd feel that I was judged for it, so I usually avoided it. Living by myself means if I want to go to a party or buy a pile of network switches for experimentation or get into soldering, I can just do it without worrying what my parents will think. I think delaying that stage has been really bad for my development.