we're not old until the places we live stop being temporary housing. or other such things like that.
and that could be 23, or 27, or whenever you get married.
but make no mistake,
we're far from old. we just don't like to think of it that way because then we have to face that we're still young and immature. at least i know i am.
you don't grow old with age. you become older when you have something to take responsibility for. your home. your kids. your wife/husband. tl;dr