We have no idea why some people reach the age of  70,80,90 or beyond while others die young, my mother survived the Halifax Explosion ( the largest man-made explosion on earth until the Atomic bomb was dropped,) her brother and a cousin in the house, very near the explosion, died, when the house collapsed.  My mother and others walked the streets for days in one of the biggest snowstorms to ever hit Halifax, following the explosion,  I survived the second Halifax explosion when the Naval Magazine blew up in 1944, our house had a little damage,  then imitating my father and his army cohorts, I up and drank a quart  beer bottle  that my mother had filled with turpentine, I survived with a few external scars, but my digestive system wasn't harmed!  My point is that survival until 70 years of age is a lot of luck and some living right!  By living right, I mean following some of the laws of nature, by exercising, trying to eat properly, and laughing, mostly laughing!  I have come close to death many times by accident, but it's always almost!!!! So far!