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Madame Jeanne Calment of France was the world's oldest living person until she died at 122 years old; there are currently six women in the world whose ages are well documented as 115 years or older (Diebel 2014).

Supercentenarians are people living to 110 years or more. In August 2014, there were seventy-five verified supercentenarians worldwide—seventy-three women and two men. These are people whose age has been carefully documented, but there are almost certainly others who have not been identified. The Gerontology Research Group (2014) estimates there are between 300 and 450 people worldwide who are at least 110 years of age.

Centenarians are people living to be 100 years old, and they are approximately 1,000 times more common than supercentenarians. In 2010, there were about 80,000 centenarians in the United States alone. They make up one of the fastest-growing segments of the population (Boston University School of Medicine 2014).

People over ninety years of age now account for 4.7 percent of the older population, defined as age sixty-five or above; this percentage is expected to reach 10 percent by the year 2050 (U.S. Census Bureau 2011). As of 2013, the U.S. Census Bureau reports that 14.1 percent of the total U.S. population is sixty-five years old or older.

The aging of the U.S. population has significant ramifications for institutions such as business, education, the healthcare industry, and the family, as well as for the many cultural norms and traditions that focus on interactions with and social roles for older people. “Old” is a socially defined concept, and the way we think about aging is likely to change as the population ages.

A photo of an old man sitting on a couch eating an ice cream cone with a walker next to him
Society's view of the elderly is likely to change as the population ages. (Photo courtesy of sima dimitric/flickr)

References

Boston University School of Medicine. 2014. “New England Centenarian Study Overview.” Retrieved November 2, 2014 (http://www.bumc.bu.edu/centenarian/overview/).

Diebel, Matthew. 2014. “Yes, Six People Born in the 19th Century Are Still With Us.” USA Today . Retrieved November 2, 2014 (http://www.usatoday.com/story/news/world/2014/09/05/six-people-still-alive-who-were-born-in-the-19th-century/15122367/).

Gerontology Research Group. 2014. “Current Validated Living Supercentenarians.” Retrieved November 2, 2014 (http://www.grg.org/Adams/E.HTM).

United States Census Bureau. 2011. “Census Bureau Releases Comprehensive Analysis of Fast-Growing 90-and0Older Population.” Newsroom Archive , November 17. Retrieved November 1, 2014 (https://www.census.gov/newsroom/releases/archives/aging_population/cb11-194.html).

Questions & Answers

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studies of microbes
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the significance of food webs for disease transmission
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Assimilatory nitrate reduction is a process that occurs in some microorganisms, such as bacteria and archaea, in which nitrate (NO3-) is reduced to nitrite (NO2-), and then further reduced to ammonia (NH3).
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Prevent foreign microbes to the host
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they provide healthier benefits to their hosts
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They are friends to host only when Host immune system is strong and become enemies when the host immune system is weakened . very bad relationship!
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cell is the smallest unit of life
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cell is the structural and functional unit of life
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is the fundamental units of Life
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part of a tissue or an organ being wounded or bruised.
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Binomial nomenclature
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Source:  OpenStax, Introduction to sociology 2e. OpenStax CNX. Jan 20, 2016 Download for free at http://legacy.cnx.org/content/col11762/1.6
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