N Theories Of Aging

In contrast to the life span of a species, which is an evolved, positively selected life-history trait analogous to a biological "warranty period," aging is a byproduct of evolution analogous to the progressive deterioration of any system that increases the likelihood of failure. Inasmuch as the concept for designing a machine is fundamentally different from the concept for understanding its deterioration, it follows that a theoretical framework for understanding life span must necessarily be different from the theoretical framework for understanding aging. Therefore, the purpose of this section is to provide a brief overview of the main theories of aging. We begin with a description of the theory concerning why all sexually reproducing organisms grow old, followed by the more conventional theories ordered hierarchically—molecular, cellular, systemic, and evolutionary.

How to Stay Young

How to Stay Young

For centuries, ever since the legendary Ponce de Leon went searching for the elusive Fountain of Youth, people have been looking for ways to slow down the aging process. Medical science has made great strides in keeping people alive longer by preventing and curing disease, and helping people to live healthier lives. Average life expectancy keeps increasing, and most of us can look forward to the chance to live much longer lives than our ancestors.

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