A lot of stallion behaviours are learned, not hormonally-driven. Consequently, although it may "tone him down" a little, it is likely that a significant portion of his behaviours will remain "stallion-like". Having said that, all stallions are individuals, so you might have a more positive impact - or more negative!
It is also worth remembering that the risks associated with gelding an older stallion are more significant than with gelding a colt.
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