"In order to... it is necessary."

To live for a hundred years, you need to live in the mountains, in a dark cave, eat grass, and befriend animals (otherwise, they'll eat you!), have nerves as strong as stone, drink only water, and stay 3000-4000 km away from cigarette smoke. And when you encounter a member of the opposite sex, run away from them by about the same distance. And at the end of your life, realize that you are only different from others in that you will die healthy, get upset, and die.