I read articles about a 20% or so testosterone decline over the past 30 years (and the decreasing was already in progress for quite a time).
(I noticed things like harder handshakes, lower voices, more masculine faces and more macho behavior, harder work environment, world wars and the cold war and more presence of racism).
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Well, if the testosterone levels are decreasing at such a rate, then that is very interesting. What possible reasons could there be for this decline? Well, IMHO, there's only one which makes sense from an evolutionary perspective. Testosterone may be the primary male sex hormone, but it's also an anabolic steroid, with its anabolic effects including growth of muscle mass and strength, increased bone density and strength, and stimulation of linear growth and bone maturation. It also increases competitiveness and aggression, and plays a role in regulating cognitive and physical energy. And many of these purposes are now effectively redundant, or at the very least far less necessary than they once were. Who needs stronger muscles and bones if you no longer need to perform active physical labor to support yourself, when machines do all the labor for you? Competitiveness and aggression are impediments in a modern, civilized society, one which emphasizes egalitarianism and peace above all else. And regulating our cognitive or physical energy isn't as important any more, because we have resource abundance supplying up with as many calories as we need and then some. Testosterone just isn't needed to the same extent that it once was; the advantages of having higher levels of testosterone no longer outweigh the disadvantages, and thus the average levels of testosterone are in decline.0