Also, probably generalizing here, but I can't think of a single individual that I've ever known who lives with their parents, who I'd actually consider mature. Zip, zero, zilch. If they are mature, they tend to have some other serious mental issues.
The only exceptions I have personally found, are those that have parents move in with them. But, then the title of this thread would have been " your parents living with you is called childhood". Which, quite frankly, wouldn't make sense, yet is the basis of most of the anti moving out arguments in this thread.