I'm 14 almost 15, he's 17 almost 18.. is it illegal for us to date?

Illegal, nope, but neither is it advisable..

What has an ADULT got in common with a CHILD?

It is not illegal to date. It would, however be illegal for him to have any sexual contact with you.

Also, it might be illegal if your parents forbid it.

Finally, I really don't see what a 17 yr old would have in common with a 14 yr old.

Agree, not illegal just iladvised. If you were 50 and she were 47 no big deal but also look at a few years ago. If you were 15 and she 12, is it starting to feel weird?

If the 14 years old parents do not approve, there could be a legal issue, since a adult would be taking a child places without permission of the parents.