Final answer:
To buy alcohol in the US, one must be 21 years old. Therefore, the individual mentioned will be old enough on September 15, 2034.
Explanation:
To be old enough to buy alcohol in the United States, a person must be at least 21 years old. Given that the birthdate provided is September 15, 2013, the earliest date the individual can legally purchase alcohol would be September 15, 2034.
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