Your comment assumes smart people stop learning things when they get old, which is demonstrably incorrect. I also doubt your statement that many changes have ha

Your comment assumes smart people stop learning things when they get old, which is demonstrably incorrect. I also doubt your statement that many changes have happened because old people died. I suspect new minds had more to do with making changes than the old ones dying. And it is unknown if we would have had more or better changes if people had longer lifespans.