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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.
Best Answer: 18 is the legal age.. But I am from Mexico and I can tell you that it is not hard to drink while in mexico. you can buy your alcohol in two places, at a bar/club .. or at store/supermarket.. The first group, will ask for your ID at the door just so they keep little kids from going in the club, not because they wont sell you booze..