I'm over seventy and still use either a 4-16X40 or a 4 1/2-30X50. The hills I hunt are so steep if you slip you can go a hundred feet before you stop. A couple years ago I moved a deer from the small level spot where it fell and it rolled for at least thirty seconds. There was no way I could keep up with it.

I tried the fixed power when I was in my forties and never looked back.

"Only Christ is the fullness of God's revelation."
Everyday Hunter