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old age

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old age

Later years of life. The causes of progressive degeneration of bodily and mental processes associated with it are still not precisely known, but every one of the phenomena of ageing can occur at almost any age, and the process does not take place throughout the body at an equal rate. Geriatrics is the branch of medicine dealing with the diagnosis and treatment of disease in the elderly.

Normally, ageing begins after about 30. The arteries start to lose their elasticity, so that a greater strain is placed on the heart. The resulting gradual impairment of the blood supply is responsible for many of the changes, but between 30 and 60 there is a period of maturity in which ageing usually makes little progress. Research into the process of ageing (gerontology) includes study of dietary factors and the mechanisms behind structural changes in the tissues. Old age in itself is not a disease.
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? Mentioned in ? References in classic literature
 
Or, again, as old age is to life, so is evening to day.
The Poetics of Aristotle by Aristotle View in context
At the time I now write of, Father Mapple was in the hardy winter of a healthy old age; that sort of old age which seems merging into a second flowering youth, for among all the fissures of his wrinkles, there shone certain mild gleams of a newly developing bloom --the spring verdure peeping forth even beneath February's snow.
Moby Dick I-LXVII by Melville, Herman View in context
That the question therefore was not, whether a man would choose to be always in the prime of youth, attended with prosperity and health; but how he would pass a perpetual life under all the usual disadvantages which old age brings along with it.
Gulliver's Travels by Swift, Jonathan View in context
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