Cozumel follows most other Mexican states by setting its drinking age at 18 years.
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Mexico requires that young adults show photo identification, either a passport or driver's license, as proof of age when buying alcohol. Be prepared to have your ID at most resorts, bars, restaurants, and nightclubs, even though most are not strict in their practice of checking.
In the United States, the minimum legal age to purchase alcoholic beverages is 21 years of age; the two exceptions are Puerto Rico and the Virgin Islands where the age is 18. The legal drinking age varies by state, and many states have no age requirements for supervised drinking with one's parents or legal guardians.
In Africa, the legal drinking age is generally set at 18 years old, as seen in countries like Botswana, Kenya, Malawi, and Zimbabwe. Similarly, in Latin America, 18 years old is the prevailing legal drinking age in countries such as Brazil, Chile, Mexico, and Uruguay.
Roaming with your own cell phone is possible if you have a GSM phone but it is expensive. You may want to buy a SIM card from a Telcel or Movistar outlet. You can buy credit for your SIM card in supermarkets, newsstands, online, etc.