2. Per the Macmillan dictionary, aged is an adjective: aged, adj. : someone who is aged 18, 35, 70, etc. is 18, 35, 70, etc. years old. A woman aged 50 has given birth to twins. Men aged between 18 and 35 are most at risk from violent crime. In the second case, a group of students that are of college age are college age (not college aged) students. More @Wikipedia
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