Underage and underaged are both correct according to American Heritage Dictionary, but tho most common one is underage . However, most dictionaries don't cover underaged :
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AnonymousCould someone tell me which one is right?They are both right, but 'underage' has greatly overtaken 'underaged' in terms of frequency of use. See the Google Ngram at the link below.
AnonymousAm I correct in saying it would be safe to write "my underage friends went drinking"?Yes. It is preferable to 'underaged'.
AnonymousI'm just wondering if you have seen something making a reference to one being an adverb and the other an adjective?I have not.
Anonymous I'm not sure if I am able to post linksYou can do that.
AnonymousYahoo AnswersEverybody and his brother posts opinions there. It's not my go
My underaged friends went drinking.
Because it makes more sense with the ed knowing that it was past tense