Yes. Especially when the people are working for tips.
Part of it is a compliment. "Oh, you look like you could be underage." It's saying you're youthful looking, without actually saying it. It's noticed, and pleases people, and they're more generous.
Part of it is the rules. If someone is too old for the compliment to do a ton, they general are more appreciative of the rules being followed in general, and will take it as good service.
Either way, you're more likely to get a tip, or a bigger tip, and so it happens a LOT with someone who works for tips.




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