As it turns out, that’s almost never quite what’s going on from a medical perspective. Aging – in and of itself – is not a cause of death.

When most of us say that someone died of old age, what we really mean is that someone died as a result of an illness (like pneumonia) or as a result of an event (like a heart attack) that a healthy, stronger person would likely have survived.

http://www.businessinsider.com/what-does-it-mean-to-die-of-old-age-2016-6

http://www.livescience.com/32241-do-people-really-die-of-old-age.html
Keeping elderly cells old to understand the aging process
http://rspb.royalsocietypublishing.org/content/282/1821/20143085

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