It completely depends on the boy, none are the same if you like the guy just be yourself because you should only be with someone if they like you for you not if they like someone you pretend to be. try to talk to them and be confident in yourself and just see how things go.
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this 17 year boy is not mature enough to stay with his own age group.
He want to look cool with pre-teens.
You should stay away from him...and should stick with same age group of friends.
It is certainly legal in most places.
Though in some countries dating is all that is allowed, there should be no sexual intercourse. Check your local legislation.