By Paleo Life Coach Editorial Team · Last updated October 3, 2026 · Based on published demographic studies of hunter-gatherers
Ask most people how long cavemen lived and you’ll hear “about 30.” It’s one of the most repeated facts about prehistory, and it’s the wrong way to read the numbers. Stone Age life expectancy really was low. But a low average doesn’t mean adults dropped dead at 30. It means huge numbers of babies and children died, which drags the average down. Once you separate childhood from adulthood, a very different picture of Paleolithic life appears, and this guide walks through the evidence and the arithmetic behind it.
The quick version: Stone Age life expectancy at birth was roughly 21 to 37 years, based on modern hunter-gatherer studies. That low average reflects child deaths: only about 57% of children reached 15. People who survived to adulthood often lived into their 60s or 70s, and the most common age of adult death was about 72.
How do we know how long Stone Age people lived?
Nobody kept birth records 20,000 years ago, so researchers use two imperfect lines of evidence: skeletons from archaeological sites, and careful demographic records of recent hunter-gatherer groups whose way of life resembles that of Paleolithic foragers.
Skeletons can show sex, injuries and rough age. The problem is aging adults. Anthropologists estimate age from features like tooth wear and bone changes, and those methods tend to underestimate the ages of older people. Older, more fragile bones also survive less often.
Living and recently studied foragers, such as the Hadza of Tanzania, the !Kung of southern Africa and the Ache of Paraguay, give firmer numbers because researchers recorded actual births and deaths over years or decades. They aren’t a perfect stand-in for the Stone Age: many had some contact with outsiders, new diseases or trade goods. But they’re the closest living evidence we have.
The most cited study pulling this data together is by anthropologists Michael Gurven and Hillard Kaplan, published in Population and Development Review in 2007. They analyzed mortality data from hunter-gatherer and forager-horticulturalist groups around the world (Gurven & Kaplan, 2007). Most of the numbers on this page come from that paper.
For background on the period itself, see our guide to the Old Stone Age.
What was the average life expectancy in the Stone Age?
Among traditional hunter-gatherers, average life expectancy at birth ranged from 21 to 37 years, according to Gurven and Kaplan. That’s the figure behind the “dead by 30” idea. But the same paper shows that adult lives were far longer than that average suggests:
- On average, 57% of children born survived to age 15 among hunter-gatherers.
- Of those who reached 15, 64% reached age 45.
- People who reached 45 could expect about two more decades of life (20.7 years on average for hunter-gatherers).
- The most common age of adult death was about 72, with a range of 68 to 78 across groups.
The authors’ summary is blunt: “The modal age of adult death is about seven decades, before which time humans remain vigorous producers, and after which senescence rapidly occurs and people die.” They add that “it is the rare individual who survives to age 80.”
Why “average life expectancy of 30” doesn’t mean people died at 30
Life expectancy at birth is an average of everyone’s age at death, including babies who died in their first year. When a large share of deaths happen at ages 0 to 5, the average falls sharply even if most adults live to old age.
Worked example: rebuilding a Stone Age life expectancy from three numbers
Start with 100 births and apply the Gurven and Kaplan averages for hunter-gatherers:
| Group | How many of 100 | Assumed average age at death | Years lived (people x age) |
|---|---|---|---|
| Die before 15 | 100 – 57 = 43 | 2 years (most child deaths come early) | 43 x 2 = 86 |
| Die between 15 and 45 | 57 x 36% = 20.5 | 30 years (midpoint) | 20.5 x 30 = 615 |
| Reach 45 | 57 x 64% = 36.5 | 45 + 20.7 = 65.7 years | 36.5 x 65.7 = 2,398 |
| Total | 100 | 3,099 |
Survival figures from Gurven & Kaplan (2007), Table 2 averages for hunter-gatherers. The average ages at death within the first two bands are our simplifying assumptions, not published figures.
Divide the total years lived by 100 people: 3,099 ÷ 100 = about 31 years of life expectancy at birth. That lands right inside the published 21-37 range.
Yet in this same imaginary group, more than a third of everyone born lived to their mid-60s on average, and the people you’d have met as adults were often grandparents. The “30” is real as an average. As a description of a typical adult life, it’s wrong.
How long did people live in different hunter-gatherer groups?
Life expectancy varied a lot from group to group, mostly because of differences in child deaths and violence. The most common age of adult death varied much less.
| Population | Life expectancy at birth | Most common age of adult death |
|---|---|---|
| Agta (Philippines) | 21 | Not reported |
| Hiwi (Venezuela) | 27 | 68 |
| Hadza (Tanzania) | 34 | 76 |
| !Kung (southern Africa) | 36 | 74 (1963-74 data) |
| Ache, forest period (Paraguay) | 37 | 71 |
| Tsimane (Bolivia, forager-horticulturalists) | 42 | 78 |
| Sweden, 1751-59 (for comparison) | 34 | 72 |
| United States, 2002 (for comparison) | Not in table | 85 |
Source: Gurven & Kaplan (2007), Tables 2 and 4. The !Kung modal age uses the 1963-74 data period.
Two things stand out. First, 18th-century Sweden, a farming society with churches and record-keeping, had about the same life expectancy at birth as many foragers. Second, the modern United States pushed the most common age of death from the low 70s to 85. By comparison, U.S. life expectancy at birth was 79.0 years in 2024 (CDC National Center for Health Statistics, NCHS Data Brief No. 548, January 2026).
A 2012 study in PNAS put the scale of that change in perspective: human mortality “has decreased so substantially that the difference between hunter-gatherers and today’s lowest mortality populations is greater than the difference between hunter-gatherers and wild chimpanzees” (Burger, Baudisch & Vaupel, 2012). The authors note most of that improvement has happened since 1900.
What did Stone Age people die of?
Infections, not old age or heart disease, were the main killers. Gurven and Kaplan compiled 3,328 recorded deaths from forager groups:
| Cause of death | Share of all deaths |
|---|---|
| All illness (mostly infections) | 70% |
| Of which: respiratory illness | about 24% |
| Of which: gastrointestinal illness | about 14% |
| Violence (homicide and warfare) | 12.5% |
| Degenerative disease | 9% |
| Accidents | 8% |
Source: Gurven & Kaplan (2007), Table 5. Respiratory, gastrointestinal, violence and accident shares are averages across groups with good-quality data, so rows don’t sum exactly to 100%.
Violence varied enormously in the same dataset. Among the Hadza it accounted for about 3% of deaths; among the forest-period Ache, more than half. Diarrhea combined with malnutrition was one of the biggest killers of infants and young children.
The paper also notes that heart attacks and strokes “appear rare” and that obesity was rare, blood pressure low and cholesterol and triglyceride levels low. That’s often cited in favor of ancestral eating. It’s worth reading carefully: these people were also extremely active, rarely lived into their 80s, and chronic diseases are the hardest causes of death to identify without hospitals. It shows that heart disease wasn’t the common killer it is today, not that diet alone explains why.
Why do some sources say cavemen only lived to 15 or 20?
Those figures usually come from skeleton-based life tables. Gurven and Kaplan note that it’s “usually reported that Paleolithic humans had life expectancies of 15–20 years,” but they question those estimates.
The telling detail: skeleton-based profiles imply that people who reached 45 had only about 3 to 7 more years to live, and that mortality after 45 was more than seven times higher than in living foragers. Because prehistoric people “cannot be very different genetically” from the living groups studied, the authors conclude there “must be systematic biases in the samples and/or in the estimation procedures at older ages.” In plain terms: older skeletons were probably being assigned ages that were too young.
There’s also evidence that surviving to older adulthood became much more common over human evolution. By comparing the ratio of older to younger adults in fossil dental samples, anthropologists Rachel Caspari and Sang-Hee Lee found “a dramatic increase in longevity in the modern humans of the Early Upper Paleolithic,” the later part of the Old Stone Age (Caspari & Lee, 2004).
Common misconceptions about Stone Age lifespans
- “People were old at 30.” Adults who survived childhood commonly lived into their 60s and beyond.
- “Nobody lived long enough to be a grandparent.” Gurven and Kaplan estimate that even without modern health care, “at least one-fourth of the population is likely to live as grandparents for 15–20 years.”
- “Stone Age people lived longer than us because of their diet.” The data don’t show that. Modern populations live far longer, mostly because children survive and infections are treated.
- “Life expectancy at birth equals typical age at death.” In high child-mortality societies, the two can be 40 years apart.
- “The numbers are exact.” They’re estimates from recent foragers and incomplete skeletons. Treat any single figure as a range.
For a picture of daily life around those numbers, see what Paleolithic life was really like and what Paleolithic humans actually ate.
Frequently asked questions about Stone Age life expectancy
How long did cavemen live?
Stone Age people had a life expectancy at birth of roughly 21 to 37 years, based on studies of recent hunter-gatherers. But that average includes many infant and child deaths. People who reached adulthood often lived into their 60s or 70s, and the most common age of adult death was about 72.
Did anyone live to 70 in the Stone Age?
Yes, very likely. In hunter-gatherer populations studied by demographers, the most common age of adult death ranged from 68 to 78. Gurven and Kaplan note that many people stayed healthy and working through their 60s, fewer remained strong in their 70s, and it was rare to reach 80.
Why was life expectancy so low in the Stone Age?
Mostly because so many children died. On average only about 57% of children in forager groups reached age 15. Infections, especially respiratory and gastrointestinal illness, caused about 70% of recorded deaths, and violence and accidents added more. Without vaccines, antibiotics or clean water, childhood was the dangerous part of life.
What was life like during the Old Stone Age?
People lived in small, mobile groups, hunting, fishing and gathering wild plants, and made tools from stone, bone and wood. Work was physical and daily, and illness was the main threat to life. Our guide to what life was really like in the Paleolithic covers shelter, fire, food and social life in detail.
What are the three Stone Ages?
The Stone Age is usually divided into the Paleolithic (Old Stone Age), the Mesolithic (Middle Stone Age) and the Neolithic (New Stone Age). The Paleolithic is by far the longest; the Neolithic is when farming spread. The Old Stone Age guide explains how the Paleolithic itself splits into three phases.
Does the paleo diet make you live longer?
There’s no evidence that it does. Stone Age foragers didn’t outlive modern people; their shorter lives were driven by infections and child deaths, not diet. Trials of the modern paleo diet show short-term improvements in some metabolic markers, but none has measured lifespan. See paleo diet health benefits for what the research does show.
Your next step: read the averages with the right question in mind
Whenever you see a single life-expectancy number for the Stone Age, ask whether it’s life expectancy at birth or the expected lifespan of someone who survived childhood. The first was low; the second looks surprisingly modern. If you’re interested in how that history shaped today’s eating advice, start with the paleo diet guide and the history of the paleo diet.
Research cited in this guide
- Gurven M, Kaplan H. Longevity Among Hunter-Gatherers: A Cross-Cultural Examination. Population and Development Review, 2007 (PDF, UC Santa Barbara)
- Caspari R, Lee SH. Older age becomes common late in human evolution. PNAS, 2004 – PubMed
- Burger O, Baudisch A, Vaupel JW. Human mortality improvement in evolutionary context. PNAS, 2012 – PubMed
- Mortality in the United States, 2024. NCHS Data Brief No. 548, CDC National Center for Health Statistics, January 2026 (cdc.gov/nchs/products/databriefs/db548.htm)