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Your license has your birthdate on it, right? So if they give you trouble for the license saying you're not 21, you point to the birthdate. 'Look! The license is out of date!'
Some states have a vertical license for people under 21 and horizontal for over 21, so clerks at liquor stores can check quickly. But if you just turned 21, you'll have an under-21 license so you point out the birthdate on the license.