Last fall we gelded a 6 year old stallion and a 9 month old colt.
(We went together with a neighbor who had some 2 year olds done and we split the
farm call, etc.). The older guy had an awful time and took a long time to
heal which I expected but not as bad as it was and as much as we took care
of keeping it clean and sprayed with disinfectant. The neighbor's 2 year
olds took a lot longer to heal than I would have thought but I am not sure how
diligent he was with aftercare. Our 9 month old youngster was bucking and
playing the same evening as if nothing had even happened to him! I had
never gelded one so young before but it was the best gelding I've ever
experienced (at least as the human). :) I will never leave a colt I
know I am absolutely not keeping as a stallion until they are a year or
more. I was very pleased with how quickly this youngster healed...he
had very little swelling that first day and none after we turned him out and he
could run and play. We still sprayed the stuff the vet gave us on
him. That was our experience anyway and is my humble opinion. Miles of
smiles, Maggie