Don't know about the "man" part as I am mainly just a big kid It all comes down to whether you want to live your life or you want to live what others think your life should be. If you like being tied to your parents till they or you die, and do it by choice, then fine. As long as that choice is voluntarily made, I think it's ok. But in order to make that choice, I think one needs a few years away from the parents. Trust me, they'll be fine
Of course extenuating circumstances can exist such as sick parents, money troubles, etc. I am not denying that sometimes it is financially and practically impossible to separate and move on. Usually financially it is more difficult to separate from parents but that should not prevent the action!
I must also note that when I say "move on", I do not mean cut contact with family. One can still be there when the parents/grandparents really need help (or you need theirs). What I am talking about here is mainly gaining "independence" before marriage...