Under Illinois law, the age of consent for any type of sexual activity is, typically, 17 years. This means anyone younger than 17 years of age cannot lawfully consent to any type of sex act involving sexual conduct. Sexual conduct is the touching of any sex organ of another.

Does Illinois have the Romeo and Juliet law?

In Illinois, there is a limited Romeo and Juliet exemption for criminal sexual abuse. The conduct is still illegal, but someone protected by this exception will face the possibility of smaller fines and reduced jail time than someone who is charged with felony sexual assault or abuse.

Can a 15 year old date a 13 year old legally?

If dating includes sex (or any form of sexual activity) then the answer is NO - and parental approval is irrelevant. If you are under 16 then you may not lawfully engage in any sexual activity (not just intercourse) with anyone.