For most of the world, throughout most of human history, the average life expectancy from birth was around 24. This figure fluctuated greatly depending on the time or region, and was higher than 24 in most individual years, but factors such as pandemics, famines, and conflicts caused regular spikes in mortality and reduced life expectancy.
Child mortality
The most significant difference between historical mortality rates and modern figures is that child and infant mortality was so high in pre-industrial times; before the introduction of vaccination, water treatment, and other medical knowledge or technologies, women would have around seven children throughout their lifetime, but around half of these would not make it to adulthood. Accurate, historical figures for infant mortality are difficult to ascertain, as it was so prevalent, it took place in the home, and was rarely recorded in censuses; however, figures from this source suggest that the rate was around 300 deaths per 1,000 live births in some years, meaning that almost one in three infants did not make it to their first birthday in certain periods. For those who survived to adolescence, they could expect to live into their forties or fifties on average.
Modern figures
It was not until the eradication of plague and improvements in housing and infrastructure in recent centuries where life expectancy began to rise in some parts of Europe, before industrialization and medical advances led to the onset of the demographic transition across the world. Today, global life expectancy from birth is roughly three times higher than in pre-industrial times, at almost 73 years. It is higher still in more demographically and economically developed countries; life expectancy is over 82 years in the three European countries shown, and over 84 in Japan. For the least developed countries, mostly found in Sub-Saharan Africa, life expectancy from birth can be as low as 53 years.
Average life expectancy from birth in selected regions and time periods from 33CE to 1875 CE
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OECD. (December 31, 2006). Average life expectancy from birth in selected regions and time periods from 33CE to 1875 CE [Graph]. In Statista. Retrieved October 05, 2024, from https://www.statista.com/statistics/1069683/life-expectancy-historical-areas/
OECD. "Average life expectancy from birth in selected regions and time periods from 33CE to 1875 CE." Chart. December 31, 2006. Statista. Accessed October 05, 2024. https://www.statista.com/statistics/1069683/life-expectancy-historical-areas/
OECD. (2006). Average life expectancy from birth in selected regions and time periods from 33CE to 1875 CE. Statista. Statista Inc.. Accessed: October 05, 2024. https://www.statista.com/statistics/1069683/life-expectancy-historical-areas/
OECD. "Average Life Expectancy from Birth in Selected Regions and Time Periods from 33ce to 1875 Ce." Statista, Statista Inc., 31 Dec 2006, https://www.statista.com/statistics/1069683/life-expectancy-historical-areas/
OECD, Average life expectancy from birth in selected regions and time periods from 33CE to 1875 CE Statista, https://www.statista.com/statistics/1069683/life-expectancy-historical-areas/ (last visited October 05, 2024)
Average life expectancy from birth in selected regions and time periods from 33CE to 1875 CE [Graph], OECD, December 31, 2006. [Online]. Available: https://www.statista.com/statistics/1069683/life-expectancy-historical-areas/