I got my colt gelded the second he dropped at 10 months old. I had people tell me I should wait a bit longer, let him fill out more, etc. But, he had brain damage. He turned nasty the second he dropped offering to kick me multiple times which he had never even thought of doing before. Snip snip and right away he was back to the same sweet boy.
I personally wouldn't wait. I think you would struggle and fight and constantly be on guard for the one or two years of waiting after they've dropped. Then when the time finally comes and they make a large personality change (though it may be too late for such a change then) you'll be kicking yourself in the butt for not doing it sooner. I would personally want to keep my boy a calm tempered "early" gelding than deal with a crazy unpredictable stud with brain damage for two unnecessary years, but that's just me LOL.
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