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Some people refer to men as "boys", as in, "Hey, boys...", "They are my boys...", or "Flyboys" (aviators).
"Boys" and "girls" are common colloquial terms that can have no relevence to age.
Another example, where I grew up, we would refer to a group of people, or even a group of females, as "guys", as in, "Do you guys want to go catch a movie?" Even girls use the term guys when referring to a group, so it has nothing to do with gender in that context.
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