I am wondering which one is correct:
English Language Learners Stack Exchange is a question and answer site for speakers of other languages learning English. It only takes a minute to sign up.Sign up to join this community
Either one works and they're very similar; most native speakers will probably not draw a distinction between them. "School-aged" refers to children aged to the point of attending school (and, implicitly, not beyond that); "school-age" refers to children of an age at which they should attend school (that is, neither too old nor too young).