… . Those testosterone levels look normal for his age… .
Yes they might be and that is possibly a normal part of the aging process. We can choose to roll with the punches or fight. Now I know I’m not your Dad and am probably 20 years his junior. However, I intend to go out fighting. Not that I want to live a day longer, but I want the quality of those days to be as good as I can. HRT has helped me enormously and maybe it can for your Dad as well. I don’t know. However, read my post on HRT as I suggested above. I had dreadful changes in muscle:fat ratios and I’ve reversed it. I aged well before my time in many ways and have stopped it.