Does the adults also use the word "dude"?
Yes, "dude" can be used by all ages. It is a very casual slang form so it is usually used amongst friends, same-aged people, or people you are very familiar with. It is typically used as a greeting or placeholder for the name of a male, but recently it is being used for women as well. Ex: Dude, how's the new job going? Ex: Dude, is that my dress you're wearing?
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