Studies show that the male sex hormone, testosterone, begins to peak as a man moves from his teens into his 20s. Injuries, lower T, etc all hurt a ton.

First, we need to know where this alleged mismatched peaking comes from in the first place. Physical is much lower. Scientists measured peak sex hormones in men and women …

And if you take good care of yourself, physical abilities can remain intact far longer than many suppose. As long as a man has that potential, he is a man in his prime. By age 18, male testicles are producing the most testosterone they ever have -- or will -- in a man's lifetime. After that age point, a man’s physical strength will usually decline throughout the remaining years of his life, unless he decides to use TRT (Testosterone Replacement Therapy) or HGH (Human Growth Hormone) to keep his body functioning like a younger … And when exactly are men in their prime? Intellectually and emotionally, men start to fully mature about age 40.

According to various studies, the official answer to “What age is a man at his physical peak?” is anywhere from his late 20’s to his early 30’s. Physically, early to mid-20s. As for a man’s mental prime, psychological studies have shown that he reaches his problem solving peak at around 19 years of age but his memory peaks at around 28 years of age, and then at around 45 years … Probably 18-25.
This results in erections that are fast and firm, and a … Life was much easier physically in that age range. As Medical Daily writes explaining the research, the idea that men are maximum horndogs at 18, while women don’t go nuts for the juice until they are 35, is based on Kinsey research from 1953.