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 Haiti.
In the capital Port-au-Prince, it is prohibited to sell or serve alcohol to minors under 18 years old from May 17, 2017. Vendors are required to check identification. The Senate voted on a proposed Law on the protection of minors from alcohol beverages, to establish a legal purchase age of 18 and related implementation measures, in December 2012. The law has not yet been approved and enacted. Law prohibiting minors entry to entertainment venues Article 1 prohibits those under the age of 16 from entering cinemas and theaters (except during children's programming), clubs, cafes, or venues licensed to sell alcohol beverages.
You can find more legal details and links here:
Wikipedia Legal Drinking Page