This I have heard of. (Particularly on upper chest) Experience it myself moderately. I will say that this is normal. Even on folks not taking AAS.
@y777 mentions skin _thickening_ which is a new one on me. (Except feet… why some people as they get older let their feet get so dang gross I don’t know) Ech…
The foot skin thickening thing is the result of slowing growth, counterintuitively, allowing a buildup of the substances that make skin cells stick together, so it gets thicker instead of falling off as new cells grow behind it, drying, and cracking.
I became something of an expert on this when my heels cracked so badly in the winter I could barely walk.
Apply Urea 40-60% cream every day, right out of the shower, while they're still moist. Urea is the body's natural mechanism for retaining moisture in the skin, and will resoften, and slowly allow dead skin to just fall off, If you consistently apply it, within a couple of months your feet, no matter how gnarly, will look normal and healthy again, You can buy it on Amazon or get a prescription from your doctor. One amazing thing about this cream, despite its ability to break down hardened skin, it has no effect on living skin cells, so you can't hurt yourself with it. Once down to soft, healthy skin, it doesn't do anything but act as a moisturizer.
Also, a major source of drying out foot skin is standing barefoot in the shower. Standing in hot, soapy water dries out the bottom of your foot. Using shower shoes (ie flip flops) keeps your foot from soaking in it and losing all its moisturizing oils.
I also don't wear shoes at home, which help keep feet healthy.
By following these steps, my feet are (now) literally indistinguishable from a 20 year old's.
....I'm determined never to get "old person feet", because like you said, they get nasty., and I see dudes in their early 30s with them.