I am 45 and 40. Some of my best stock were in really steep broken up terrain. But then the 3:30-4:00 o'clock storms roll in and the wind screws up the thermals, and BAM. No mo deer.
My 3 high country buck kills were at 10, 15, and 25 yds. In my experience, with a little patience you can get very close to high country bucks. Of course that doesn't always work....