We know in the field of aging that some people tend to senesce, or grow older, more rapidly than others, and some more slowly.
S. Jay OlshanskyWe have grown accustomed to the wonders of clean water, indoor plumbing, laser surgery, genetic engineering, artificial joints, replacement body parts, and the much longer lives that accompany them. Yet we should remember that the vast majority of humans ever born died before the age of 10 from an infectious disease.
S. Jay OlshanskyAgeing is very rare. We only see it in humans and laboratory animals and in zoo animals and in our pets. Basically, organisms that are protected from the external world. Once you create that protection, you live long enough to see ageing.
S. Jay Olshansky