Gladen would be 55 or 56 and would not be in Stormwind Unless in was popping in to get something, Any Gladen should in the Caverns of time instance for mount Hyjal. If Gladen was there, he would be Strutting his Stuff, Most probably Drunk But still fully qualified to teach the newly coming up mages of Stormwind.
If you have seen Gladen in His red outfit i have had it for quite awhile and i claim thats my Archmage gear. that is what he would wear. if you haven't, there a red pointy hat, can i say more.