Well, after reading the article I find that he doesn't plan to do away with himself at 75, but rather intends to reject screening tests and medical treatment after that age. I have to say, I somewhat agree with that. I don't see the point in mammograms, colonoscopies, etc. ad nauseum after a certain point in life.
So in that regard, I think his article is not accurately titled that he "Hopes to Die" at 75. He states, "At 75 and beyond, I will need a good reason to even visit the doctor and take any medical test or treatment, no matter how routine and painless.”
I also agree with this, from the article... "Americans seem to be obsessed with exercising, doing mental puzzles, consuming various juice and protein concoctions, sticking to strict diets, and popping vitamins and supplements, all in a valiant effort to cheat death and prolong life as long as possible."
So, though I get the "pompous ass" vibe from his writing style, I have to say that I agree with much he has written. None of us wants to die; but none want to live in infirmity, either. As others of you have stated, quality of life is paramount. I will be curious as to how his outlook changes as he approaches 75, assuming that he makes it that far.