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The minimum legal drinking age in Mexico, including Cancun, is  18 years old. Mexico requires that young adults show photo identification showing proof of age when purchasing alcohol, but this practice is not always strictly enforced at most resorts, bars, and nightclubs.
Alcohol is not sold between 2 a.m. and 6 a.m. Legal Age for Drinking/Serving Alcohol You must be 21 to drink or work at a bar in California, but there is no age limit for handling alcohol in retail stores as long as a manager who is 21 or older is supervising. You can work in a restaurant that sells alcohol at age 18.