I fear humankind is headed to creating our own dreaded Star Wars Death Star through the inventions of technological modernity. Honestly, I don’t know why human life expectancy has increased so much in modernity, because historically our ancestors were lucky to live past 30yrs old, and at the same time they were probably in better physical shape.
Our success is probably due to health zealots. Everywhere you go people are reading labels, trying new diets, and buying local. People are showing concern. They want to know where their food comes from, what kind of pesticides where used, where GMOs used, and does it have gluten. This probably adds up with new healthcare technologies to produce people that at least live longer happier lives.
Despite the good news, I do foresee some obstacles to physical health in the modern world.