Is it illegal for a 22 year old to date a 15 year old if the parents are OK with it?

This is a very tricky matter of law because in most states, inluding here in Michigan, the age of consent is generally 16 yrs of age. Consent meaning that the minor child is at an age where they can make certain sexual decisions (i.e. who to date, engage in sexual relations, etc.) on their own without parental consent. Anyone under the age of 16 is considered without the ability to consent to such actions, thus making things such as dating and definitely sexual intercourse illegal. My advice is to contact a criminal defense attorney in your area to determine what the age of consent is for your State. Also, remember that althought the other person is 15 and the parents are ok with it, the Law has to be ok with it as well to make it a "legal" relationship with no criminal liability. So check with an attorney in your area for more information on your situation.