RedFish here

Red I would not judge your progress by your sex drive. "Other" medication, depression, anxiety, other related etc can drive that right down.

I had a bout with depression when I was around 50. Nobody found a cause, "they" think it was similar to women's menopause, AKA changes in bodily chemistry due to aging. It is probably why I got into a bad car crash and now have a pin from my left knee to my ankle, along with some screws. I remember nothing about the crash, tho I remember maybe 6 miles before, and woke up in the hospital.