do you need a person over 21 for each room you get on the cruise ship or just one for the whole group.

The cruiselines have different age requirements. Below are the age requirements by cruiseline.

Cruise lines that require at least one person in each cabin to be 18 or older:

Cruise West
Cunard
Fred. Olsen Cruise Line
Majestic America Line
Oceania
Orient
P&O Cruises
Peter Deilmann
Regent (Radisson)
SeaDream
Star Clippers
Uniworld


Cruise lines that require that either 1) All passengers in a cabin must be 18 or older, or 2) If anyone in the cabin is younger than 18 years old, someone in the cabin must be 25 or older:

Clipper
Disney
GAP Adventures
Silversea
Viking River Cruises


Cruise lines that require at least one person in each cabin to be 21 or older:

Azamara
Celebrity
Costa (25 for March and April sailings)
Crystal
Delta Queen
Voyages of Discovery
Great American River Journeys
MSC Cruises
Norwegian
Princess
Royal Caribbean
Seabourn


Cruise lines require that either 1) All passengers in a cabin must be 21 or older, or 2) If anyone in the cabin is less than 21 years old, someone in the cabin must be 25 or older:

Carnival
Holland America
Windstar


Exception: married couples who are both 18 are allowed to board unaccompanied. Proof of marriage is required.

Consumption of Alcohol

Once you've left port, the minimum age for the consumption of alcohol varies by cruise line.

Cruise lines that require passengers to be 18 and older to consume any type of alcoholic beverage:

Fred. Olsen Cruise Line
GAP Adventures
Oceania
Regent (Radisson)


Cruise lines that require passengers to be 21 and older to consume any type of alcohol, except for cruises departing from European and South American countries (a parent who is sailing with a passenger who is between the ages of 18 to 20 may sign a waiver allowing him/her to consume alcohol onboard):

Celebrity
Royal Caribbean


Cruise lines that require passengers to be 21 and older to consume any type of alcohol:

Carnival
Clipper
Costa
Cruise West
Crystal
Cunard
Delta Queen
Voyages of Discovery
Disney
Great American River Journeys
Holland America
Majestic America Line
MSC Cruises
Norwegian
Orient
Peter Deilmann
Princess
Seabourn
SeaDream
Silversea
Star Clippers
Uniworld
Viking River Cruises
Windstar


Cheers, Neil

AlieseMarie, Welcome to Cruise-Chat!

I hope Neil's awesome post answered your question.

Which cruise line are you asking about?

Welcome Aboard,

Dwayne