The dream in which you see your classmates, but in your waking life you are an adult, denotes to the old times and memories you are thinking of. Maybe there is some situation in your waking life that has much common with your past? Think about it. The dream about classmates could also indicate your relationships with those people, especially if you are still associating with them.
Classmates dream meaning
Read more about dreaming of Classmates in other dream meanings interpretations.