That isn't describing normal aging. It's describing late-onset hypogonadism, which occurs in a subset of men. To see what happens to testosterone levels across

That isn't describing normal aging. It's describing late-onset hypogonadism, which occurs in a subset of men. To see what happens to testosterone levels across the population, see the graphs in the first link from my original post. Through the 40s, 50s and 60s, variance increases but average levels don't significantly decline. The condition I have could be late-onset hypogonadism (i.e. a slow drop over time) but based on the timing and nature of the onset of symptoms (and my age) is more likely to be a sharp drop in production following COVID. The difficulty in determining the latter for sure is that my levels before COVID were not known. This is also a challenge with determining the epidemiology of such sudden changes. Levels would need to be observed across the drop in a sufficient number of cases, but people are generally only measured after symptoms appear. Nonetheless, such drops are known to occur both due to injury and infection, and idiopathically.