No they can not.
Yes it can.
Yes, if the 16 year old is a physical or psychological threat to the 17 year old (stalking, threatening...) and if said 17 year old testifies against the 16 year old to legitimize the claims.
You can be friends however not including sex as tis would put the 17 year old in trouble with the law.
Yes.
A 17 year old is 17 years old.
If a 17 year old wants to move in with an 18 year old then the person who is 17 needs to ask their parents to move in with this friend scince the 17 year old is not an official adult
No. First of all, the 13-year-old is basically still just a child, so the 17-year-old would be guilty of child molestation or grooming for molestation and can be and should be put in jail or sent to obligatory counseling.
If the 17 year old has parental consent.
If the 17 year old has the permission of the parents.
It is okay for a 17 year old to date a 23 year old
No, a 17 year old can not move out with a 19 year old in Illinois without parent approval. If the 17 year old has approval, they can move out.