On Kilmanjaro last year (I'm 51 years old), at 18,700 feet, without oxygen, I decided to turn back within an hour of the summit (19,300') due to the fact that I was losing conciousness and falling down from time to time. I'm here.......the dead climber on Everest is not.
Ya pays yur admission, ya takes your chances.
Did you see the skeleton of the leopard?