If said girl is a minor in her state, yes.
You can go to jail for that!!
depends
Yes.
The age of consent there is 16 so it's legal.
yes, you know it can happen!
It will depend on the laws in the jurisdiction in question. In most places it would not be illegal in any way.
It is very likely that they will go to jail or to prison. The age difference and her being 14 would make it a crime in just about every jurisdiction in the world.
It depends on the laws of your state.
That will be up to a judge to decide.
It depends on where you live.
Yes. if you are 18 you can be prosecuted.
If the guy is 18 and over and the girl or parents report it to police, yes. But I believe with bail. 17 & younger, no. It's not illegal.