Why won't my boyfriend move out of his parents' house?

I’m 26 I bought a place of my own when I was 21 and I’ve been completely financially independent for several years (my parents helped me out with some bills when I was finishing up college). My boyfriend is 24, he still lives with his parents but has had a job since he was 21. Not just any job, a career. I know he makes more money then I do and he’s living rent free. He has a new truck, but that’s really the only thing he spends money on. He could buy something very easily however; he seems to have no desire to move out on his own. I think it’s great that he has a good relationship with his parents, I do too, but why doesn’t he want to grow up?
Why won't my boyfriend move out of his parents' house?
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