We are taking out grand daughter age 17 and her friend age 18, with us on a Canada cruise in June.
We have to get an notarized permission from the 18 yr old Parents to take her out of the country.
When i asked a carnival rep why I needed this since she was 18, She explained that Carnival doesn't consider a person an adult until they are 21.
After all it's their house and their rules. (The last was my comment not theirs)