not neccesarily, sure they wouldn't get anything against for a minor, but they are still campers.
I actually was a CIT 2 who was 18. Heck I was 18 a week after CIT 1 was over! I started CIT a year late.
I remember having a co-counselor. It kind of stinks. It was at 5th grade camp and the school wouldn't allow people under 18 to be alone in charge of a group overnight. So I had a teacher in my cabin. There was definitely a feeling of not being in charge! I also butted heads with a co-counselor in trying to just figure everything out.
