Say there were a nineteen year old male, who is very mature, has a deep voice, acts like a grown adult, is laid but but serious, sort of the intellectual type, very gentleman like, speaks sort of like a politician, would you think this guy is weird? Especially you young people, would you think he's a loser?

I think it would be rather grand.
*Like a Sir*
Capital outfit today sir, you look smashing.
Ay any o' you blokes lookin for a good time?
Suffice it to say, I would need to actually meet you and get to know you to tell you.
I knew one guy just like that who was 17 and acted like an upper class elderly man, it was horrible.
they tend to be extremely smart, but are very awkward when it comes to social skills.
it's possible the way he was raised my have something to do with it too, hard to say.
Edit: I wouldn't think he is weird.