Petunia,
from the Carnival web site:
Quote:
Are there any age restrictions on board?
Drinking Alcoholic Beverages:
Guest must be 21 years of age or older to be served alcohol on board. Proper I.D. with birth date is required.
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From my experience, this is being inforced the way it is written down. My younger brother (who is 25 and doesn't look younger) had to present proof of age quite a few times on the "Carnival Liberty" this summer - even when he wanted to order a beer with his dinner. For him as a German this was quite unusual (he found it annoying first, later amusing) as here in Germany you are allowed to drink beer from the age of 16.