Well, It first depends on your state's law. In most states the age of consent is 18. But that's only for sex! Right now of course you can date. But both people have to be over the age of consent to have sex. So answering your question, no it isn't illegal to DATE someone who is 21 when the other is 17. But when that person turns 18, you guys can do whatever.
no
No.
no
it isn't illegal to date, but it is illegal to have sexual intercourse.
It is not illegal for anyone to date.
In Florida, it is not illegal for a 22-year-old to date a 17-year-old as long as there is no sexual activity involved.
Yes. He is an adult at 23 and she is a minor at 17. It is illegal.
Yes. Sorry.
No because that is illegal.
It depends on what state you are in, but generally No.
It is LEGAL
Yes. Dating is not illegal. Having sex with a minor is illegal.