I met a couple guys from Kansas a few years ago back in 2009. I was mid 40’s then. One guy was around my age, and his partner was 76 years old. CO OTC. My second year elk hunting and I was heading up and had to take a break at over 11,000’ when I saw them side hilling about 100 yards below me. So don’t let anyone tell you a guy can’t hunt high elevation at that age.
FF to 2022. The unit is now a draw unit. Driving back to where I was going to hunt, I ran into the same 2 guys driving out. They had been up in the area I was heading to. No walk in the park above 11,000’. That would make this man 90 years young. I know it’s probably exception rather than the rule at 90 but I say your dad is a free man with a free will and should not be told how, when or where to hunt. If he wants to go OTC then I say go OTC and go kill an elk