Why the fuck should there be a need to justify living away from home at a certain age? I'm 25 and living at home, and i keep out my parents way and they keep out of mine. They're more than happy for me to still be at home, in fact i think they fear having an "empty nest". And meanwhile i'm saving plenty of money. My sister just moved out, like last month, and she's 27. Living at home until that age has allowed her and her fiance to save a deposit and move into a new house. With the way the real estate market is in sydney these days you don't have much choice other than to live at home until your mid twenties.