We are a commune of inquiring, skeptical, politically centrist, capitalist, anglophile, traditionalist New England Yankee humans, humanoids, and animals with many interests beyond and above politics. Each of us has had a high-school education (or GED), but all had ADD so didn't pay attention very well, especially the dogs. Each one of us does "try my best to be just like I am," and none of us enjoys working for others, including for Maggie, from whom we receive neither a nickel nor a dime. Freedom from nags, cranks, government, do-gooders, control-freaks and idiots is all that we ask for.
Without heavy regular use, muscle fibers die (never to be recovered) or atrophy (can be recovered with effort). Such is the fate of the middle-aged body. Young people can add new muscle fibers with exertion, old people can not.
In later years, it is easier to improve strength and endurance than bigger muscles. See discussion.
If you consider testosterone to be a PED, then yes.
"Normal" T levels are considered to be 300-2100. That's almost a 3 octave range, and the only hormone considered "normal" over that large a range. The 2100 is a healthy 20 year old,while the 300 is a 70 year old who isn't in a wheelchair.
I once watched an online debate between a proponent of T supplementation and an opponent. When asked if he would do nothing if he was presented with a 25 year old man with a t level of 300, the opponent tap danced all over. The proponent tried to get him to admit that anything under 800 should be considered treatable with t supplementation, but he kept wiggling about considering age.
The proponent said what I was thinking by that point: (paraphrased)
"In other words, you old geezers should just sit in a corner and die quietly."