Hey man it depends.... I lived with my parents from 24-26 saving up money to move out west... nothing wrong with that... worked my ass off, partied hardy and saved like a hermit
I moved out at 19 and now I am back home because i'm not well. They are sort of well off and I get along with them really well so I don't feel too bad about it. I think it depends on how much money your parents have, whether you get along with them and how much freedom you are given as opposed to how much you want. A lot of my cousins in England are living with the parents in their early 30s. I don't think you should heed any society imposed rule about it. Just do what feels right.
If they like living at home, and their parents don't mind/like them living there, and they are not a lazy ass rude losers than I'd say ...as long as you want. These are the types guys we need so we can laugh at them while we watch them on YOuTube videos of them tripping on salvia.
I live with my folks purely for financial reasons and because I'm single. I have worked for 11 years and always pay them rent. Round here unless you're on a high income it's impossible to make ends meet on your own. It really annoys me when you tell people that you live at home and they look at you like there's something wrong with you and can't look after yourself. Ok, not financially but if I had the money I would live on my own. I am fortunate in that my parents are retired and go away, often abroad about 12 times a year, so I get the house to myself a lot. Infact they have just gone away for a few days this weekend. I know of several friends/acquaintances who are in the same boat. I also know a girl who is a similar age to me, single and a doctor on a VERY good salary and she still lives at home. With her it's more that she just enjoys her parents' company. You can't put an age on it in my opinion as everyone's circumstances are different, be it personal, financial or both.
i like this answer. can't really narrow it down any more than that. i moved out at 18 and can't imagine going back, but there's lots of circumstances where i think it's ok to live with your parents, at least until around 30 or so. and then it's still not necessarily wrong to stay with them.
i moved out at 17 but i had a messy home life and didn't really live "on my own" till i was 18 going on 19.