i have a question does age matter ?? if its up to the girl to choose who she wants to date ?

baby mommy 💋

im 18 guys so im not asking this for me im asking for a younger friend of mine who is 17 and is dating a 21 year old she loves him and he loves her but ive done some research depending on ur state its TOTALLY legal to date as long as she wants too but is this true ??