Earlier quoted context omitted.
Testosterone actually peaks around age 20 and gradually declines after that, accelerating around age 30. By 40, it's been falling for a long time.
I'm finding vast disagreement over whether testosterone peaks at 20 or closer to 40. Can you provide some good sources? Some sources show it declining drastically from 20 to 40 (by as much as 90%), others claim it peaks between 35-40 and gradually declines. It seems to be all over the map. For example: "Studies show that most men experience a 2% drop-off in testosterone production each year after they turn 30." http:…
Interesting, thanks. My sources are no better than yours; it was news to me to hear that there is disagreement over this.