<i>And this fall, in Africa, I got to see him in action again. Over 16 days of “go, go, go,” my dad, who’s now 80, always seemed to be at the head of the pack. On most days we started at 6 a.m., crisscrossing the dry Serengeti, or climbing rugged rainforest terrain for hours before returning to our home base, where we ate and drank late into the night. We climbed mountains, crossed rivers, and traversed deserts. Dad was right there the whole time, pushing us all to our limits. </i><p>This sounds like superior genes more so than lifestyle . Some people's bodies give out earlier in life...stuff like heart disease, stoke, cancer, hypertension which may or may not be related to lifestyle.