The short answer is that no one knows for sure. The growth of the prostate gland is a complex process that starts at puberty and continues throughout adult life. As a man ages, his prostate grows, although the rate of growth and size of the prostate varies from individual to individual. It is certain that prostate growth, whether it is benign or malignant, requires testosterone and a derivative of testosterone, dihydrotestosterone. Centuries ago, it was observed that the castrati, the Italian opera singers who were castrated at puberty to preserve their tenor voices, never developed enlargement of their prostates.
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