What if you are a 14 year old female dating a 17 year old male when he turns 18 will it be illegal for us to still date if we live in Florida?

It's not illegal to *date* (assuming your parents are okay with it, because they get to decide who you're allowed to spend time with). It is illegal to have sexual contact (which is not limited merely to intercourse), and it was illegal to do that even before he turned 18.