For approximately half of the population, supplementing testosterone into old age is a great way to maintain (and build) SMM along with that physical activity which TFA admonishes the lack of.
I was too, basically the article is saying to lift. Which I do agree
with but if you're suggesting TRT (testosterone replacement therapy), something that has definitely become popular and is being advertised heavily - I'd caution that it's not for everyone and there have been plenty of lawsuits filed already and problems allegedly associated with it. I guess like everything, check with your doctor which the article does suggest. At least 9 products have been named in the litigation. Fortestam, AndroGel, Axiron, Androderm, etc.
You do have to wonder about guys like Arnold Schwarzenegger, who is 71 (ridiculous) and is in better shape than most. I can't imagine how much work he has to put into to keeping that up. Supplements can only do so much.
It's true that Arnold is quite a specimen. And on Reddit there was recently a video of a ninety year old man deadlifting 400lb. https://www.facebook.com/SPORTbible/videos/1131499677007260/ He doesn't quite get the full range of motion but it's still damnably impressive.
Other than the cost the biggest complaint is the injections. A lot of people are simply afraid of needles, and at the very least it's a 15 minute process once or twice a week. The whole point of TRT is to keep testosterone in the normal range, so there theoretically shouldn't be any health downsides, only upsides, once you get the bloodwork to see what dosage your body requires.
For approximately half of the population, supplementing testosterone into old age is a great way to maintain (and build) SMM along with that physical activity which TFA admonishes the lack of.