Monday, August 24, 2009


John W. S.

We are no longer a youthful society. The proportion of individuals at

different ages has become increasingly similar. Since the beginning of

recorded history, life span, the maximum number of years an

individual can live, has remained at approximately 120 to 125 years

of age. Since 1900, improvement in medicine, nutrition, exercise, and

lifestyle have increased our life expectancy an average of 30 additional years.

In industrialized countries, the number of centenarians (individual 100

years and older) is increasing at a rate of approximately 7% each

year. In the United States, there were only 15,000 centenarians in

1980, a number that had risen to 77,000 in 2000, and it is projected

that this number will reach more than 800,00 by 2050. It is estimated

that 75 to 100 super centenarians (individuals 110 years or older) in

the United States and about 300 to 450 world wide. Many people

expect that “the older you get, the sicker you get.”

However, researchers are finding that is not true for some

centenarians. Nobel-winning chemist Linus Pauling argued that vitamin

C slow down the aging process.

Linus Pauling 1922

However there is a difference in life expectancy between male and

female. The overall life expectancy for female is 80.7 years of age,

male 75.4 years of age. Beginning in the mid-thirties, female out

number male; this gap widen in the remaining of the adult years.

By 75 years of age, more than 61% of the population is female;

for 85 and over, the figure is almost 70% female. Men are more

likely to die from leading causes of death such as cancer of the

respiratory system, motor vehicle accidents, cirrhosis of the liver,

emphysema and coronary heart disease.

X chromosome

In reality all species, females outlive males. Women have more

resistance to infection and degenerative diseases. The female’s

estrogen production helps to protect her from arteriosclerosis

(hardening of the arteries). The additional X chromosome that

women carry in comparison to men may be associated with the

production of more antibodies to fight off disease.

Life have just enter another stage!

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