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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.
1 Previously young people over the age of 16 could purchase and consume alcohol <15% ABV, and adults aged 18 and over could purchase alcohol over 15% ABV.  As of March 2015, the autonomous community of Asturias raised its drinking age from 16 to 18 years. Asturias was Spain's last community with a drinking age of 16 years. The new law brings the drinking age into line with the rest of Spain.