I’m sorry to hear about your friend. I read once several years ago that the average life expectancy a man can expect after prostrate cancer is 5 years whether it’s cured or not. It was something to that effect. Maybe because it is more of disease that affects older men that keeps it that low.
My father had it and had radiation treatment in 1985, at the age of 66, which worked for him. Unfortunately he passed away in 1990 so he hit right at the 5 year mark.
Now my oldest brother just went through it as well and he is 72.
Interesting. My FIL had it years ago and he just turned 80.