There was a study, published in 2014 by the University of Utah, which found a negative correlation. Companies with highly paid execs did significantly worse than companies run by mere mortals. You should Google it; the details are interesting.
I believe you, but only because of the particular details you included: you train hard every day, and you used to be overweight and sickly. Otherwise, even a reasonably fit 50-year-old is no match for a normal, unathletic 20-year-old.
At 40 I was slim, fit, and healthy, with good stamina, and sexually very active. At 50 I was beginning to notice changes, and my activity level dropped. By 60, all the above had changed dramatically, due in part to specific medical issues.
To discourage such shenanigans, many states require that creditors allow a certain minimum amount of time - typically 14 days - between actual receipt of your bill and the payment due date. You might want to look into this.
I am an avid reader who just received my first Kindle as a Christmas present. A couple of books later, I have noticed that my reading speed on the Kindle is a fraction of what it is for the same text on paper. I decided to re-read a novel before starting its sequel, and after a few chapters switched back to my old paperback. I found myself reading about 3 times faster on the physical book.
This is at least partly because there is so little text per page on the Kindle, a function of both display size and line- and letter-spacing. But beyond that there is also an issue with readability or legibility. The font used on these devices is remarkably ugly.
These are not permanent, unchangeable characteristics of E-readers, so I hope things will get better as the products evolve.
Retirement means that when someone says "Have a nice day", you actually have a shot at it.