The minimum legal drinking age in Mexico, including Cancun, is 18. While many tourists drink in the street, it is illegal to do so in Mexico. Mexico requires identification showing proof of age when purchasing alcohol; this may not be strictly enforced in some areas.
Since the legal age is 18, families should recognize that older teens receive wristbands with unlimited access to alcohol at all-inclusive resorts. Customers can legally purchase alcohol 24 hours a day in Cancun, except during major elections. The Mexican government puts dry laws in place up to 72 hours before an election, and tourists are expected to follow the law. There are no specific laws regarding having alcohol in automobiles, but police do target drunk drivers.