May depend where you live - where I live, housing is very, very expensive, even with renting, anywhere halfway decent is really expensive especially if you’re not house sharing, so it’s not really seen as unusual for people to stay at home all through their twenties or later - I’m 34 and still at home. I’m probably edging into unusual territory tho. I quite like living with my mum tbf, I do a lot of the housework, food shopping etc so a bit more like housemates.
But that’s probably just because it’s just me and her now - loved my dad, wish he was still here, but think hed be driving me mad if he was still around!