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 Central African Republic.
It is prohibited for any person to sell or supply alcohol beverages to minors under the age of 15 years when sold or supplied off-premises (e.g., liquor stores, wine stores, and supermarkets). It is prohibited for any person to sell or supply alcohol beverages to minors under the age of 21 years when sold or supplied on-premises (e.g., restaurants, bars, and cafes).
You can find more legal details and links here:
Wikipedia Legal Drinking Page