Anyone can climb Everest. There have been 80 year old women and 6 year olds, handicapped, blind, and everything in between. There is no level of fitness nor skill required.
Just pay the money and follow the guide's instructions and if you are in the 99.9% of the time that the weather is as forecasted, then you have climbed Everest. If in the 0.1% of the time that a freak storm appears out of nowhere, then you could be the most fit and experienced climber in the world and you are a goner.
Running a mile under 6 minutes is more of an accomplishment than climbing Everest and I would submit, that 80% of the people who have climbed Everest could not have run a 6 minute mile the week before, and that 100% of sub 6 minute milers can climb Everest if they are in the 99.9% that the weather is as forecast when they make the attempt.
As far as climbing the highest point in all 50 states, anyone with lots of money and leisure time can do it. By the way nothing wrong with doing it, I am sure it is fun and I am not one of the envious criticizing it. I am just pointing it out is not an achievement of any sort, it is simply a fun thing to do.