I lived downtown during undergrad and went back home during the summers. Now that i'm in Grad school, I have moved permanently downtown.
I could never live at home full time again. I love my parents but they're not positive people. My parents have told me they'd be happy if I lived at home, but I know how negative they can get so I refused politely.
However, I know some people who live with their families until their late 20's by choice and both sides enjoy it mutually.