When you get really old- walk! My grandfather lived to 94 with half a neck (removed in his 60s due to esophageal cancer from smoking), had a brick wall fall on him breaking half is body (he worked construction his entire life in the bronx after emigrating from Italy - after surviving a fascist POW camp in WW2 eating rats). Our family has been landowning farmers in southern italy for more generations than i can count- so after "retiring" from construction he spent all day maintaining the modest flower/veg gardens at his house and my fathers, 3 miles away. 6 miles walking every day, then 3-4 hours per house gardening. The guy was one coiled spring of sinew, essentially. Eventually his body gave out, went to hospital, died 3 days later. Aside from those 3 days he walked and worked every day.