Life Expectancy Vs. Life Span
Life expectancy is often confused with life span to the point that they are nearly synonyms; when people hear 'life expectancy was 35 years' they often interpret this as meaning that people of that time or place had short life spans. One such example can be seen in the In Search of... episode "The Man Who Would Not Die" (About Count of St. Germain) where it is stated "Evidence recently discovered in the British Museum indicates that St. Germain may have well been the long lost third son of Rákóczi born in Transylvania in 1694. If he died in Germany in 1784, he lived 90 years. The average life expectancy in the 18th century was 35 years. Fifty was a ripe old age. Ninety... was forever."
This ignores the fact that the life expectancy generally quoted is the at birth number which is an average that includes all the babies that die before their first year of life as well as people that die from disease and war. The genetics of humans and rate of aging were no different in preindustrial societies than today, but people frequently died young because of untreatable diseases, accidents, and malnutrition. Many women did not survive childbirth, and individuals who reached old age were likely to succumb quickly to health problems.
It can be argued that it is better to compare life expectancies of the period after adulthood to get a better handle on life span. Even during childhood, life expectancy can take a huge jump as seen in the Roman Life Expectancy table at the University of Texas where at birth the life expectancy was 25 but at the age of 5 it jumped to 48. Studies like Plymouth Plantation; "Dead at Forty" and Life Expectancy by Age, 1850–2004 similarly show a dramatic increase in life expectancy once adulthood was reached.
Read more about this topic: Life Expectancy
Famous quotes containing the words life, expectancy and/or span:
“All my life long I have been sensible of the injustice constantly done to women. Since I have had to fight the world single-handed, there has not been one day I have not smarted under the wrongs I have had to bear, because I was not only a woman, but a woman doing a man’s work, without any man, husband, son, brother or friend, to stand at my side, and to see some semblance of justice done me. I cannot forget, for injustice is a sixth sense, and rouses all the others.”
—Amelia E. Barr (1831–1919)
“O, what a noble mind is here o’erthrown!
The courtier’s, soldier’s, scholar’s,eye, tongue, sword,
Th’ expectancy and rose of the fair state,
The glass of fashion and the mold of form,
Th’ observed of all observers, quite, quite down!”
—William Shakespeare (1564–1616)
“The last bear, shot drinking in the Dakotas
Loped under wires that span the mountain stream.”
—Hart Crane (1899–1932)