Very true. But it's easy to crank testosterone, and see what happens.

Easy? How?

Options include intramuscular injection, slow-release implants, and skin creams. I prefer skin creams, because you get a ~normal diurnal cycle. And old-school cream, not Androgel or Testim. Because it's much less expensive, and leaves ~no residue.

If you actually have low testosterone, many doctors will prescribe supplements. It may take some work to find one who doesn't consider age-related decline to be "normal", and so not warranting treatment. And if you can't, then you'll need to shop online.

Strength exercise seems to help https://www.webmd.com/men/features/exercise-and-testosterone...

You really shouldn't use WebMD as a primary source for anything.

They are a content farm owned by Internet Brands and their only focus is creating content as vehicles for pharmaceutical and consumer packaged goods advertisements.

Weightlifting without a doubt increases your testosterone. After weight training consistently for about 8 months, there are definitely changes beyond muscle growth

Makes sense to me.

But there's a problem, if your testosterone level is too low. In my experience, that increases the risk of tendonitis. Also, it didn't seem that exercise did much good. At least, not for strength training.

But with testosterone supplementation, exercising builds muscle and reduces fat. And no tendonitis. Also better blood sugar management, and less acne. Maybe even darker hair. But clearly not more hair on my head.

That's interesting you attribute low testosterone to tendonitis because high testosterone does the same thing. In fact, that's why steroids (testosterone ethanate) can increase the chance of injury in abusers because the muscle grows in strength far faster than the tendons so they tear. However, the benefits of testosterone supplementation vastly overweight the cons if you are naturally low and I suspect that it starts a positive re-enforcement cycle where increased testosterone increases muscle which then stimulates more testosterone production until a good equillibrium is met.