We're not trying to make us live forever; we're not trying to even make us live significantly longer. What we're trying to do is extend the period of healthy life.
From S. Jay Olshansky
In centenarians and supercentenarians - people over 110 - you see a higher level of fecundity much later in life.
Researchers have been looking for biomarkers of age for a long time and have failed. People sell tests out there to measure your biological age, and none of them work. There's no evidence that you can measure biological age with any reliability.
Just because someone looks old doesn't mean he or she is. The skin of some people who spend a lot of time outdoors seems to age very rapidly. Someone can look 80 or 90 and only be 40 to 50.
You can open up a centenarian's brain, and you'll see some areas that look like that of a 50-year-old or of a 110-year-old. You can have variation in the basic process of aging, called senescence, in different parts of the same body.
The only control we have over the duration of our life is to shorten it, and we do that all the time.
Exercise is roughly equivalent to an oil lube and a filter for a car. You don't have to do it, but when you do, it makes the car run a lot better.
Once you avoid the things that accelerate aging like smoking, obesity, excessive alcohol consumption, and excessive sun exposure, you've done about as much as you can to influence your aging process.
The reason we have cancer and heart disease is the same reason you can't get rid of the wear and tear on your tires on your car: as soon as you use them, you are wearing them away. You can't make eternal tires, and it's the same with the human body.
When you hit your 40s, you begin to take notice of the effects of aging because people that you know begin to die of heart attacks and tumors, so we take notice of the effects of aging.
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