I doubt it. Chances are the older one will get into legal trouble. They should wait till they are both at least 18.
it is legal
no
Yes.
Yes!
NO, it is not legal, it is against the law.
Yes, the legal age for a relationship is 18. In many places, the parent consent is 16.
I think an abstinent relationship is legal anywhere between anyone.
With a sexual relationship, no it is not legal.
it depends what state you live in
No, you should get arrested.
yes.maybe.
It depents on the country you are from