OK. I can see where you're coming from.
It's not that way in the West. Most Western women with options wouldn't take a man who still lives at home past 25 seriously.
I am American and I have dated a guy who lived at home with his parents at 31.... He had a career, no kids, his own car..... He was the breadwinner in his household and was supporting his fam..... I have my own place so we did our business at my place

But to your thread question, too old is whenever the child is ready for the world.... each person is different...I knew that there is "1 queen to a throne" I respected that my mother built her queendom with my dad in their house..... At 17 I moved to a different state and built my own throne..... I haven't looked back since....
But my younger sister (who just got married)...moved out at 26.... I don't knock folks for staying at home.... everyone is different...