A job -- sure. But a common situation in cities would be for a 20-something to live with their parents until (and sometimes after) they got married due to the very limited housing. When I came to the US in my mid-20s I was absolutely stunned that it was possible for someone working an unskilled job (which is what I did for my first year) to rent a small apartment of one's own (in a sketchy part of the town, sure) and invite whoever I please whenever I want.