At what age do you not need to bring ID to buy alcohol?

[waffle]

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My favorite is the sign that says we card people under 35(or whatever) if you can tell when somebody is under 35, why cant you tell if they are under 21.

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If you try to card everyone who is under 35, and in some cases, your age guess is off by a few years, you'll still catch all minors.

Not the case if you try to card everyone who is under 21 and in some cases you guess wrong.

Fascinating huh? (I hope I just didn't get leveled.)