It is illegal for a 16 year old to have a sexual relationship with anyone 18 or older. Parent or individual consent is irrelevant because as accurately stated above, you cannot consent to an illegal act.

Can a 15 year old date a 18 year old in Illinois?

No it isnt illegal unless you have any kind of sexual relationship. Just petting could result in criminal charges for the 18 year old , and landing him on the sex offender registry for life.

What can 18 year olds do Illinois?

Heres a quick list of what you can legally do:Buy and collect winnings from a lottery ticket.Buy pornography.Go to most strip clubs.Work at a strip club.Apply for a loan (so you can buy the lottery tickets and pornography)Get a hotel room.Change your name.Skydive and bungee jump.More items •1 Jul 2016