Your genes sure as hell didn't evolve to make you immortal, either. They evolved in the hopes that you'll live long enough to make a few new copies of them, and

Your genes sure as hell didn't evolve to make you immortal, either. They evolved in the hopes that you'll live long enough to make a few new copies of them, and engineering the vital parts of the body to last significantly longer wasn't a high priority. I'd be disinclined to throw out the huge volume of research on the subject of what actually causes heart disease and cancer due to a pithy slogan.