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I have a friend who is 35 and still lives with his parents.
He bought a place with his fiancee when he was about 28, and they moved in together. They split up five years later. He moved back in with his parents. Literally, his childhood bed in his childhood room.
To make matters even better, his brother-in-law and sister also live at the family house. He gets to hear them boning occasionally.
Awesome.