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At 2000 BC, the average human life expectancy at birth was only about 18 years. As of 2009, the CIA World Factbook shows the average life expectancy of humans worldwide at birth is 66.67 years (64.5 years for males and 68.8 years for females).

Excavations in A??kl?hoyuk have reached the bottom layer, revealing information about the first settled life that began there 10,300 years ago. The more than 80 skeletons found in the area show the approximate average lifespan of the people living there then was between 25 and 30 years.

Hacettepe University Anthropology Department lecturer Professor Y?lmaz Selim Erdal said the examinations on the skeletons revealed that people lived to 40 years of age 5,000 years ago. ?The life expectancy of the Early Bronze Age and its contemporaries is around 35-40 years. Infant and child mortality is very high.

5,000 years ago (3000 BC): Settlement of Skara Brae built in Orkney. 4,600 years ago (2600 BC): Writing is developed in Sumer and Egypt, triggering the beginning of recorded history.

Lasting roughly 2.5 million years, the Stone Age ended around 5,000 years ago when humans in the Near East began working with metal and making tools and weapons from bronze. During the Stone Age, humans shared the planet with a number of now-extinct hominin relatives, including Neanderthals and Denisovans.

The Social Security Administration's middle-range forecasts indicate that in 2050 e(0) will be 80.0 and 83.4 years for males and females, respectively (table 2). The Census Bureau (CB) forecasts that in 2050 e(0) for males and females will be 80.9 and 85.3 years, respectively.

Since the mid-20th century, medicine and improvements in nutrition and quality of life have lengthened life in old age. But while the number of supercentenarians?people over 110?has increased exponentially, the age they reach has not, suggesting that longevity has not been significantly extended.

'Nobody has come close to the world record, but there are no biological process that put an absolute limit on maximum age', said aging researcher, Professor Tom Kirkwood of Copenhagen, and Newcastle University.

In 1996, for example, a mathematical analysis1 by Caleb Finch and Malcolm Pike at the University of Southern California in Los Angeles used the Gompertz model to estimate a maximum human lifespan of around 120 years ? a reasonable ceiling, given that only one person had reached that age.

Humans could live until the ripe old age of 150 years according to recent research ? and scientists are racing to work out how. Harvard geniuses, biohackers and internet billionaires are all looking for ways that humans can crack the code on aging.