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If the hypothesis is borne out by further studies on, for example, Italian castrati, it will raise more questions. If exercise increases testosterone, how will this affect the longevity of post-menopausal women? Will testosterone patches make men die happier but sooner?
How does one balance fitness with potentially eroded immunity?

I suspect that the stats will prove themselves, but that the answer will be that castrati did not serve in the military, were less aggressive than unaltered males, and thus had a lower injury and side effect rate.