My cousin is sort of an oddball - sorry, I’m sure this will offend some people.
He is late twenties and never diagnosed with anything. But he is very awkward socially. Doesn’t have any friends really, he socialises with other cousins that are younger than him by about 7 years, but more awkward around his own age group.
Never had a girlfriend (or boyfriend) - hard to say if he is actually interested. Never really talks about that sort of stuff. Still rather close to his mum as closer than to any friend, well he still lives at home.
He had his childhood teddy bear well into his teenage years.