Nice looking mount and surely something to be proud of. You're right...the turn around time is quick especially since you got him in November as opposed to early season.
I am not sure about it being an old deer, when I dropped my coyote off at the taxidermist I got to look overy Rybo's buck and our taxidermist was telling me that he was amazed the the deer looked very young. From what he was telling me, he figured it to be a 2-1/2 year old.