Average life expectancy at birth around the year 1700 was roughly 35 to 40 years in England, and similar or lower across most of the world. That number, though, is one of the most misunderstood statistics in history. It doesn’t mean people were dropping dead at 35. It means so many infants and children died that they dragged the average down dramatically, masking the fact that plenty of adults lived into their 60s, 70s, and beyond.
What the Numbers Actually Looked Like
The best historical data comes from England, where parish records of births and deaths have been studied extensively. Research from Cambridge’s Group for the History of Population and Social Structure places English life expectancy at birth between 35 and 40 years throughout the entire period from 1600 to 1800. This wasn’t a single fixed number. It fluctuated year to year depending on harvests, epidemics, and war.
Conditions varied widely by region. In colonial America, death rates in settlements like Jamestown ran as high as 40 to 50 per thousand people annually, comparable to or worse than European villages. New England was a different story, with death rates of only 24 to 26 per thousand, likely because of lower population density, cooler climates that limited disease, and more abundant food. Where you were born mattered enormously.
Why “35 Years” Is Misleading
The confusion comes from treating life expectancy at birth as a description of how long individual people actually lived. It isn’t. It’s an average that includes every death, and in 1700, a staggering number of those deaths were babies and children. Infectious diseases like dysentery, scarlet fever, whooping cough, smallpox, and pneumonia killed roughly 30% of England’s children before they reached age 15. Drowning in wells and bathtubs was the most commonly reported accidental death in children under five. When nearly a third of the population dies before adolescence, the math pulls the average lifespan down to numbers that look absurdly low to modern eyes.
Data from medieval England (slightly earlier but illustrative of the same pattern) makes this clear. Boys born to landowning families had a life expectancy at birth of just 31.3 years. But those who survived to age 25 could expect to live to about 50.7, on average. Surviving childhood was the single biggest hurdle. Once past it, reaching old age was entirely realistic.
What Killed So Many People
The leading killers were infectious diseases, and cities were the deadliest places to live. Large concentrations of poorly fed, poorly housed people created ideal conditions for what historians call “crowd diseases”: typhus, smallpox, and tuberculosis. Bubonic plague still swept through urban populations periodically, though its worst years were behind it by 1700. Smallpox was arguably the most feared disease of the era, killing rich and poor alike.
Children faced additional dangers beyond disease. Work-related accidents were common since children labored in trades like tanning, blacksmithing, and sailing, where chemical poisonings, fires, and injuries were routine. Even everyday tasks were hazardous. Children cracked their skulls fetching water and were trampled by horses while plowing fields. The early modern diet, heavy in coarse grains containing grit and gravel, caused painful bladder stones. Surgery to remove them carried a 30% mortality rate.
For women, childbirth posed a serious and recurring risk. Maternal mortality in pre-industrial England averaged about 1 in 100 births. That sounds modest until you consider that women typically gave birth multiple times. Over a reproductive lifetime, the cumulative odds of dying in childbirth were significant, and this rate was roughly 50 times higher than in developed countries today.
How Social Class Changed Your Odds
Wealth didn’t make you immune to smallpox or plague, but it improved your chances in almost every other way. Landowning families had better access to food, cleaner living conditions, and the ability to leave cities during epidemics. Their children were less likely to be performing dangerous labor at young ages. The life expectancy data from medieval English landowners, while still grim by modern standards, consistently runs higher than estimates for the general population.
Poverty compressed lifespans through multiple channels at once: worse nutrition weakened immune systems, overcrowded housing spread disease faster, and hazardous work began earlier in life. Urban poverty was especially deadly. Cities couldn’t sustain their own populations through births alone and depended on a constant flow of migrants from the countryside to replace those who died.
How 1700 Compares to Today
Global life expectancy at birth is now around 73 years, roughly double what it was in 1700. But the gains didn’t come primarily from extending the maximum human lifespan. People in 1700 who reached old age could live into their 70s and 80s, just as people do now. The transformation came from keeping children alive. Vaccines eliminated smallpox entirely. Clean water and sanitation wiped out most waterborne diseases. Antibiotics made bacterial infections survivable. Modern obstetric care cut maternal mortality to a fraction of its historical level.
The result is that life expectancy at birth finally reflects what an individual person can reasonably expect to live, rather than being an average distorted by mass childhood death. That distinction is the most important thing to understand about the 35-to-40-year figure from 1700: it described a population’s mortality profile, not a person’s natural lifespan.