What feature on the face makes you assume someone is older than 21 ?

In young adults What gives age away from the face that they are over 21? If they have no wrinkles, what tells you they are 21 or over?

when you look at someone, what specific things on the face give away age that they are older?

for example when suddenly you stopped getting asked for an ID to drink, I know sometimes it’s protocol to ask even if it’s evident the person is of age to drink,

but sometimes they even offer you alcoholic drinks, for example if they’re there to take your order and you ask what drinks do you have?

they will not include alcoholic drinks as options if it’s an underaged person, but what about the face of someone makes you include the alcoholic beverage?

what part of their face gave away to you that they are over 21?

is it if the person is somewhat fat that makes them look older? Or something else on the face?

What feature on the face makes you assume someone is older than 21 ?
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