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 Seychelles.
Chapter 113 Licenses Act (2010) Subsidiary Legislation: Licenses (Manufacturing) Regulation (1987), Article 8(5)(page 20): In the case of manufacturing and processing of liquor, tobacco and tobacco products, the license holder shall (i) not deliver or sell liquor to, or allow any consumption of liquor by, any person under the age of 18 years or deliver or sell tobacco or tobacco products or allow it to be used on the premises by such a person; Subsidiary Legislation: Licenses (Liquor and Outdoor Entertainment) Regulations (1998), Article 14 (page 28): (1) The holder of a license, his servant or agent shall not (a) employ or allow a person under the age of 18 years, ... (b) sell or deliver liquor, cigarettes or tobacco products to, or allow liquor to be consumed or cigarettes or any tobacco products to be used by any person under the age of 18 years on the premises; ... (i) admit any person under the age of 18 years to a premises licensed as a public bar, toddy bar or at the premises licensed to manufacture and sell baka or lapire;...
You can find more legal details and links here:
Wikipedia Legal Drinking Page