Hello,
A 24 year old and two friends will have a great time. You can pal around with each other and the cruise staff will be friendly but not overly so...
Each cruise line is different, but if I were my daughter's age (she is 26 and married) or my son (age 21 and single), I would look at RCL because there is more of a party atmosphere and a bit less on class/tradition like Celebrity and Princess.
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