Cruise Line age requirements

Does anyone know what other cruise lines let people under 25 sail alone? I know that carnival is over 21 or something like that. I think Disney is over 18, any others?? Thanks

I believe Carnival's policy is that if you are under 21 then you need to have someone who is over 25 in the same cabin with you. Unless you are married, and make sure to bring the marriage license along if you are both under 21, or unless you are sailing with your parents/guardian on the same sailing (kids in one cabin and adults in another).