When do you plan to sail on your cruise?
That's just as important as which ship, which cruise line and where you're sailing to.
Families with kids sail most often during school holidays. That means more retirees sail when school is in secession, as there are less kids aboard.
You'll find passengers from all ages aboard NCL ships, from babies to great grand parents.
When you sail determines the precentages of the different age groups aboard more than any other factor.