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From Wikipedia, the free encyclopedia

Middle age is the period of age beyond young adulthood but before the onset of old age. Various attempts have been made to define this age, which is around the third quarter of the average life span of human beings.

According to Collins Dictionary, this is "... usually considered to occur approximately between the ages of 40 and 60".

The Oxford English Dictionary gives a similar definition but with a later start point "... the period between youth and old age, about 45 to 60".

The US Census lists middle age as including both the age categories 35 to 44 and 45 to 54, while prominent social scientist, Erik Erikson, sees it ending a little later and defines middle adulthood as between 40 and 65.



Middle-aged adults often show visible signs of aging such as loss of skin elasticity and graying of the hair. Physical fitness usually wanes, with a 5–10 kg (10-20 lb) accumulation of body fat, reduction in aerobic performance and a decrease in maximal heart rate. Strength and flexibility also decrease throughout middle age. However, people age at different rates and there can be significant differences between individuals of the same age.[1]

Both male and female fertility declines with advancing age.[2][3] Advanced maternal age increases the risk of a child being born with some disorders such as Down syndrome. Advanced paternal age sharply increases the risk of miscarriage and many birth defects, including Down syndrome, schizophrenia, autism, decreased intellectual capacity, and bipolar disorder.[4][5][6][7] Most women go through menopause, which ends natural fertility, in their late 40s or 50s.[8] Rates of infertility among men also increase significantly with age, with an abrupt decline in fertility after age 45.[9]

In developed countries, yearly mortality begins to increase more noticeably from age 40 onwards, mainly due to age-related health problems such as heart disease and cancer.[10][11] However, the majority of middle-age people in industrialized nations can expect to live into old age. Life expectancy in developing countries is much lower and the risk of death at all ages is higher.[10]

Further Information

See also


  1. ^ Shephard, Roy J. (7 March 1998). "Aging and Exercise". Encyclopedia of Sports Medicine and Science (T.D.Fahey). Retrieved 2007-06-26. 
  2. ^ Rabin, Roni (2007-02-27). "It Seems the Fertility Clock Ticks for Men, Too". The New York Times. Retrieved 2009-10-16. 
  3. ^ Fertility Treatment Less Successful After 35: In Vitro Fertilization Doesn't Compensate for Decreased Fertility With Age
  4. ^ Heubeck, MA, Elizabeth; Reviewed By Brunilda Nazario, MD (2005-06-29). "Age Raises Infertility Risk in Men, Too: Risks associated with men's biological clocks may be similar to women's.". WebMD. MedicineNet. Retrieved 2009-10-16. 
  5. ^ "Miscarriage significantly associated with increasing paternal age". Columbia University's Mailman School of Public Health. 2006-08-03. Retrieved 2009-10-16. 
  6. ^ Raeburn, Paul (February/March 2009). "The Father Factor: Could becoming a father after age 40 raise the risks that your children will have a mental illness? (PDF)". Scientific American Mind: 30–33. Retrieved 2009-10-16. 
  7. ^ Cannon, Mary (2009-03-10). "Contrasting Effects of Maternal and Paternal Age on Offspring Intelligence". Public Library of Science. Retrieved 2009-10-16. 
  8. ^ BBC medical notes
  9. ^ Cannon, Mary (2003-06-26). "Male Biological Clock is Ticking, Too". WebMD Health News. Retrieved 2009-10-16. 
  10. ^ a b "Life Expectancy Profiles". BBC. 6 June 2005. Retrieved 2007-06-26. 
  11. ^ "UK cancer mortality statistics by age". Cancer Research UK. May 2007. Retrieved 2007-06-26. 

External links

Preceded by
Young Adult
Stages of human development
Middle age
Succeeded by
Old age

Simple English

For the time in history, see Middle Ages.

The middle age is the period of life between young adult and before old age. There is no fixed age, but most people think it begins when someone is about 40 years old, until the person is 60 years old.

In most countries, people that think that by middle age, people should be mature, perhaps with a good, steady job and a family. It is also common for some adults to suffer from mid-life crisis, when they are unsure about their life and sometimes become depressed because of it.


Middle-aged people begin to look older, with more wrinkles in their skin, and start to have grey hair. They become less fit, less strong, and usually gain more weight.

Middle-aged females find it harder to become pregnant. If they do have a baby, there is a higher chance that it will have a genetic disease (Down's Syndrome, for example). Females usually have their menopause in middle age, when they stop menstruating every month. When that happens, they cannot have children anymore.

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