If the answer above is None it means there is no specific mention in the legislation, but you still need to ask local law enforcement before drinking in Barbados.
It is prohibited to sell or serve any alcohol beverage to anyone under the age of 16 years. The President of the Barbados Road Safety Association is trying to raise the drinking age to 18 years because the law is often violated.
You can find more legal details and links here:
Wikipedia Legal Drinking Page