It is the period of age beyond young adulthood but before the onset of old age.
I've decided that middle age is that point in your life when you shift from seeing the future in terms of your potential and begin to see it in terms of your limitations. It's a shift that's so slow, so incremental, that we don't even notice it on a day-to-day basis.  For other uses, see Middle Ages (disambiguation) . 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. Older-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. Middle age technically refers to reaching an age where you have lived half the average life expectancy for your gender. The average midpoint of life is now about 40 for women and 38 for men (men tend to die 6 to 8 years before women). In comparison, 100 years ago women arrived at middle age by 22, mainly because so many died in childbirth. This practice was common throughout the Middle Ages. 2. 'middle age'. Middle age is the period in a person's life when they are no longer young but are not yet old. ...the onset of middle age. Men tend to put on weight in middle age. 3. 'middle-aged'. When someone has reached this period of their life, you can say that they are middle-aged. 1. middle age-the time of life between youth and old age (e.g., between 40 and 60 years of age). time of life-a period of time during which a person is normally in a particular life state. adulthood, maturity-the period of time in your life after your physical growth has stopped and you are fully developed. In European history, the Middle Ages or Medieval period lasted from the 5th to the 15th century. It began with the collapse of the Western Roman Empire and merged into the Renaissance and the Age of Discovery. The Middle Ages is the middle period of the three traditional divisions of Western history: Antiquity, Medieval period, and Modern period. The Medieval period is itself subdivided into the Early, the High, and the Late Middle Ages. What exactly is middle age? Is it when you hit 40 or 50 or 60? According to one study, the average person believes youth ends at 35 and old age begins at 58. Therefore, the years in between -- all 23 of them -- constitute middle age. Thirty-five is middle age? Ouch! We believe middle age is no longer a numerical milestone -- but rather a state of mind. Some people, at 50, feel younger than they did at 35. Or maybe they don't. Others, at 60, may be a lot more active than they were at 45. Or maybe they aren't. Translations for 'middle age'. 1  British English: middle agemiddle-age Middle age is the period in your life when you are no longer young but have not yet become old. 2  Middle age is usually considered to take place between the ages of 40 and 60. 3  NOUNMen tend to put on weight in middle age. 1 British English: middle agemiddle-age Middle age is the period in your life when you are no longer young but have not yet become old. 2  Middle age is usually considered to take place between the ages of 40 and 60. 3  NOUNMen tend to put on weight in middle age. 4  Brazilian Portuguese: meia-idade.
http://www.middleage.org/definition.shtml https://en.wikipedia.org/wiki/Middle_age http://www.womens-health-advice.com/questions/middle-age.html http://www.thefreedictionary.com/middle+age https://en.wikipedia.org/wiki/Middle_Ages http://www.huffingtonpost.com/2014/05/01/signs-of-middle-age_n_5234201.html http://www.collinsdictionary.com/dictionary/english/middle-age
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