Hi 78, more than 20 years ago I used train at Dr. Kens Iron Island Gym. He was a big proponent of 20 rep squats. Most of the powerlifter hated when he programmed them. I was around 50yo then and if I remember got up to 175lbs for 20.
If you Google Dr.Ken legendary W0 you will see he practiced what he preached. Unfortunatly he passed away this year at 71 years old.I still have all my old WO cards from then and am sometimes tempted to do one of them, but I always punk out.