Did people in the past really die at 30?

The idea that people routinely died at 30 or 40 is largely a misreading of statistics. Life expectancy at birth was low in the past, but that figure is an average pulled down by very high death rates among babies and young children. Adults who got through childhood had a reasonable chance of reaching old age. The picture is not uniform, though, and some groups did die young. [1] [2]

Life expectancy is the average of all the lengths of life in a population. Researchers at the Cambridge Group for the History of Population and Social Structure give a simple example: if one person dies at 1 and another at 100, the average is 50.5, yet neither person died anywhere near their fifties. It summarises mortality patterns and allows comparison over time, but it is not the typical lifespan or the most common age at death. [1]

The same researchers estimate that in England life expectancy at birth ran between 35 and 40 years from 1600 to 1800, yet the most common age at death for adults was around 70. In their model of England in 1841, 138 of 1,000 babies died before their first birthday and over a quarter were dead by age five. Children who reached five had even odds of reaching 60, and about 38 percent of the original babies did so. [1]

A bioarchaeologist writing in SAPIENS notes that life expectancy at birth for boys in landowning families in medieval England was 31.3 years, but those who reached 25 could expect about 25.7 more years, to roughly 50.7 on average. Because that is an average, many lived into their 70s and 80s. An Oxford University Press chapter on old age in English history makes a similar point: those who survived early life had a respectable chance of reaching their late forties or fifties or beyond, and even in medieval times a death in the late thirties was not regarded as normal or timely. [2] [3]

Skeletons support this. Bioarchaeologists estimate age from changes in the pelvic joints and by counting yearly layers of cementum on teeth, and many studies have found people who lived long lives. One study of Cholula, Mexico, between 900 and 1531 found that most people who reached adulthood lived past 50. [2]

Not every population fits the pattern of long adult lives. Research by Gazzaniga on more than 2,000 skeletons of working-class ancient Romans buried in common graves found an average age at death of 30, with many skeletons clustered around that age and showing signs of hard labour and diseases such as arthritis. The BBC report on this work stresses that the 30 was not merely a statistical quirk. [4]

Data are also a problem. Roman census papyri from Egypt under-reported men, babies and women, and tombstones leave out infants, the poor and families who died together in epidemics. Much of what is said about Roman life expectancy therefore comes from comparison with similar societies, which suggest as many as a third of infants died. Skeletal ageing has its own limit: older adults often get open-ended estimates such as 40+ or 50+, which can keep average ages artificially low. So specialists agree that low averages do not mean few old people, but the true shares of people reaching old age in particular ancient groups remain uncertain. [4] [5]

As life expectancy has risen, the gains came first at younger ages, and deaths have become concentrated in late adulthood. Global life expectancy is estimated to have risen from far lower levels in 1800 to 72.6 years in 2019. So modern people do on average live longer, mainly because fewer die young, rather than because the maximum human lifespan was once far shorter. [1] [6]