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Jon, PCa is also generally a disease for old age, when testosterone levels drop naturally, but it does occur in younger men. Similarly, PCa has been reported in men with low testosterone, but I'm not sure that any man can have zero testosterone, whether chemically or physically castrated. There is a genetic aspect to this, too. Would a man with a genetic proclivity to PCa who has been castrated nevertheless be at risk of PCa? Who knows!
It seems very unlikely that there is any research available (dearth of eunuchs) to provide a definitive answer to your "silly question" so better to bin it, don't you think?