*Facepalm* I thought you might misunderstand it, but then I thought that surely you'd be smart enough to realise the intended tone of the "or", and didn't bother editing. -.-'
"Are you a teenager or a young adult?" Since it hasn't been established that you're young, it makes no sense to interpret this question as an option-question. It's a yes or no question. If yes, you're either a teenager or a young adult. If no, you're older than that.
