A lot of young people are saddled with student loans after finishing college and have no choice but to stay at home until they can pay off their debts or increase their income to the point where they can handle both an apartment and their bills.
Personally, after college, I chose to live in a noisy, stinky, walk-up rather than live with my parents, even though I was poor and in debt.
A lot depends not on finances, but on, for lack of a better phrase, "where your head is".