What age is considered adult in cabin

What age is considered adult in a cabin? In other words, could an 18-year-old be in a cabin with a four-year-old, or would it have to be a 21-year-old or older adult with a four-year-old in the cabin? Question is for a larger family wanting two cabins side by side.

from the faq page on ncl website:

What are Norwegian Cruise Line's Age Requirements?

Age Requirements for Travel

Note: These terms are effective at the time of boarding.

Traveling with Infants:

 

• At least six (6) months of age on the day of boarding
  
• At least twelve (12) months of age on the day of boarding if your cruise has 3 or more consecutive days at sea.
  

Traveling with Minors and Young Adults:

Norwegian Cruise Lines policy dictates that a minor or young adult under the age of 21 must be accompanied in the same stateroom by a guest 21 years of age or older at the time of boarding.

 

• Minors – an individual under the age of 18 on the day of embarkation/boarding.
  
• Young Adult– an individual between the ages of 18 and 20.
  

Note: Two people under the age of 21 may travel together in the same stateroom if they are a married couple and provide proof of marriage to a Norwegian Cruise Line representative at the pier prior to boarding.

Traveling with Minors Unaccompanied by Parent or Legal Guardian*:

The following documents must be supplied at the pier during check-in:

 

• 1) Download and Complete the Parental Consent Release form (PDF)Minors or the same parent(s)/legal guardian(s) may be listed on the same form
  

 

• 2) Copy of both parents/legal guardians Driver’s License or other Government Issued IDAdoptive parents, legal guardians or persons separated or divorced are advised to keep legal and other relevant documents available in order to clarify custody rights.
  

*If travelling to Canada, you’ll the following document in addition to items #1 and 2 (Alaska, Pacific Coastal, and Canada/New England Itineraries):

Canadian entry requirements stipulate that a child under the age of 18 traveling alone, or with person(s) other than both parents, should be in possession of a letter (preferably notarized) from the parents or legal guardian containing:

 

• Authorization for the child to travel with another person and to be outside the country;
  
• The name and a 24-hour contact telephone number of the parents or guardian;
  
• The destination and length of stay in Canada.
  

 

 

Note that the above is true for booking the rooms but NCL doesn't care where you sleep. I just traveled with husband and 2 daughters, ages 13 & 15. When booking the rooms, I put one adult and 1 kid in each room. But when we got there, the kids shared a room and hubby & I shared a room.

Thank you so much for your replies. Both replies answer my question. What would I do without Cruise Critic?

You can go to the purser's desk once you board to request a key to their room.