27 and the only reason I moved out then is I met my wife then girlfriend/fiance and we bought a house.
I loved it to be honest I stacked my cash and came and went as I pleased, my parents only had one rule and that was no sex in their house; I didn't mind getting hotel rooms and going to their houses anyway when I wanted sex I actually preferred it.
It's kinda frowned upon in the Black culture due to a group think mentality in the societal culture but look at the Asians, Hispanics, Native Americans, etc. all of them stay at home generally until they are married it ain't nothing to have 4-5 adults under one roof they stack their money, split the bills, and everybody wins.
Most people 18-25 with no degree aren't making no real money like that unless they're a hell of a entrepreneur, college grad, or work an oil field job or something along those lines. Other than that people in that age range aren't making 80K or more generally.