Do you think it's lame that some adults still live at home with her parents?

I have a cousin who is like almoat 30 and she still lives at home. Why? I though at 18 or 20 you move out? Doesn't she thinks it's time to move out? She has a part time job and goes to college. I'm surprised her parents hasn't kicked her out. She makes this excuse that she can't afford to move out because she only makes...$500 a month. Isn't that how much rent is? Doesn't she have friends she can live with? Sheesh. Talk about pathetic and lazy. Just saying.