The policy used to be if you were 18 but hadn't started college yet, you could go to Vibe. As stated above, there was an incident that caused the policy to not be flexible with 18 year olds because they are legally adults. On the last cruise our 18 year old son was on with us, there was a 16 year old hanging out with the 18-20 group with her older sister. Seriously this girl was making moves on my son and texting him really inappropriate things to the point he wouldn't stay at their get togethers if she was there. It really dampened our cruise because he felt he couldn't hang out with friends he had made because of her.