I haven't moved out completely at 25. My mother rents a house and often needs help with the bills, in return if I need help with a massive deposit that some companies demand, she or other family members help. We also have quite a few vehicles but she owns none of them, recently my car was unable to drive at high speeds so I borrowed my brothers car while she used mine until I could get it fixed.
So what I consider your thread is asking is financial independence. But neither of us are independent, thus I consider us as more roommates than anything, even if I live completely alone for 8 months out of 12 and could easily stay for all 12 out of 12 like my brother did. And all of that is not considering other factors, that I won't get into.