13 is too young; the legal age for consensual relationships...should be 16, nationwide.
I was certainly mature and wise by that age, already. I would hardly call it taking advantage of a naive, ignorant, dumb, pure, inexperienced, human being.
If 16 year olds could get a job, and their driver's license/permit...they should certainly be old enough to consent legally, if they choose to.
The Law is funny and strange. Two 16 year olds could form a relationship, and it's considered sweet.
But if one of them is over 18 by a day....it's considered rape, wrong and illegal? Does that make sense to you?