In the US, no, it's not illegal (because 18 is an adult). But speaking as a woman who is close to that age, I have no clue what in the world a grown woman would want with a little kid.
No
Yes, it is illegal to have sexual contact. It is not illegal for them to date.
noup.
Yes.
yes
illegal&disgusting. get a girl your own age!
No, it's illegal.
No, it will be some category of sexual crime.
Yes it is ok
No one can stop you from dating, but it is illegal to have sex.
It's really illegal in all states.
No it is not illegal to date, however if sexual intercourse is involved then it is a different issue. No it is not illegal for a 14 year old male to "date" a 17yr old female. It may seem weird to some people, but neither party can get into legal trouble over a relationship with those circumstances.