I only moved out at 24 to move in with my then-fiancé, to whom I am now married. Were I not married, I'd probably still live with my parents.
To be fair, this whole "move out as soon as you're an adult" phenomenon is not universal. My mom's family is from Brazil, and, from what I've been told, it's not at all uncommon for people to not move out of their family homes until marriage (and sometimes not even then! -- multi-generational homes are common, or at least more common than they appear to be in the U.S.).
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I am not a textbook case of any particular disorder; I am an abstract, poetic portrayal of neurovariance with which much artistic license was taken.