I am in a similar situation to Golden Horse.
I got my colt done as soon as the vet felt comfortable doing it, which was 5 months. I knew he was dropped because I would see them within a couple weeks of birth. All my friends were impressed.
Actually my vet said that is not unusual. He said about half of them have dropped testicles from birth (or maybe it was shortly after, I don't remember).
Wolf teeth I still need to get done. He didn't have them at 5 months when he was gelded but he has them now. (He's 16 months old now). Normally with older colts my vet will take the wolf teeth when they are knocked out for castration but because I got mine done so young that wasn't an option. I figure I will ask the vet about it this spring when he comes out for shots. Maybe he can do it then.