HON Dossier on Ageing

Humanity is ageing
What is ageing?

Why people age?

Humanity is ageing

    The populations of the United States and other countries around the world are increasingly ageing.

    In 1950, only one in ten U.S. citizens was over the age of 65. Now approximately one person in 8 is in this age group (33.4 million) and it is estimated that by the year 2030 about 1 in 5 people will be 65 and over.

    Profile of older Americans.

    You can estimate your own longevity.

What is ageing?

Ageing is a progressive loss of dynamics regulating cellular, tissular and organ interaction.

Why people age?

Ageing is both a genetically programmed and an environmentally (" wear and tear ") influenced process. More than 300 theories of ageing exist: genetic, immune, "wear and tear", repair ľalteration, oxygen free radicals, mitochondrial, and "error catastrophe" theories of ageing are the most important.

Genetic factors account for about 30 percent of the variance in life expectancy. Environmental factors (life style, diet, physical exercise, smoking, and alcohol consumption) are also significantly responsible for the initiation of the ageing process.




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  http://www.hon.ch/Dossier/Ageing/part1.html Last modified: Fri Nov 1 2002