The average human lifespan is about 71.4 years globally, based on the most recent World Health Organization data from 2021. That number masks enormous variation depending on where you live, your sex, and the era you were born in. A child born in Singapore today can expect roughly 30 more healthy years than one born in Lesotho.
The Global Average and What It Means
The global average life expectancy at birth was 71.4 years in 2021, down from 72.5 years in 2020. That decline reflects the impact of the COVID-19 pandemic, which rolled back life expectancy gains to levels not seen since 2012. Before the pandemic, the world had been on a steady upward climb for decades.
It’s worth understanding what “life expectancy at birth” actually measures. It’s the average age at death across an entire population, including everyone from infants to centenarians. That means it’s heavily influenced by deaths early in life. In countries where many children die before age five, the average gets pulled down dramatically, even though adults who survive childhood may live into their 60s or 70s. Research from Stanford has shown that declines in infant mortality have been the single biggest factor in closing the gap between those who die young and those who live long lives, even more than reductions in cancer or heart disease.
How Much Location Matters
The gap between the healthiest and least healthy countries is staggering. In 2021, Singapore led the world with a healthy life expectancy of 73.6 years, followed closely by Japan at 73.4 years, South Korea at 72.5, and Iceland at 71.4. These figures represent years lived in good health, not just years alive, so total life expectancy in these countries is even higher.
At the other end, Lesotho had a healthy life expectancy of just 44.6 years. The Central African Republic came in at 45.4, Somalia at 47.4, Eswatini at 47.5, and Mozambique at 49.7. The reasons are interconnected: limited healthcare infrastructure, higher rates of infectious disease, maternal and child mortality, conflict, and poverty. A person in Singapore can expect nearly 30 more healthy years than someone in Lesotho.
Women Live Longer Than Men
Women outlive men in virtually every country on earth. In the United States, the gap is nearly six years, and it has been widening. The reasons are a mix of biology and behavior. Men have an 80% higher risk of cardiovascular disease compared to women, and tobacco use, which is more common among men, is a major driver of that difference.
Behavioral patterns extend beyond smoking. Two out of every three melanoma deaths occur in men, largely because men are less likely to wear sunscreen. Men are also less likely to see doctors for routine checkups, which means conditions that could be caught early often aren’t. These patterns compound over a lifetime, and they explain why the gap persists even in countries with universal healthcare.
How Dramatically Lifespan Has Changed
The current global average of 71 years would have been unimaginable for most of human history. In 1800, no region on Earth had a life expectancy higher than 40 years. By 1900, the global average was just 32 years. That doesn’t mean most people died at 32. It means so many infants and children died that the average was dragged down sharply. An adult who survived to age 20 in 1900 had a reasonable chance of reaching 60 or beyond.
The dramatic rise from 32 to 71 years over a single century came from a few major breakthroughs: sanitation, vaccines, antibiotics, and safer childbirth. In wealthy countries, the later gains came from reducing heart disease deaths in middle-aged and older adults. The United Nations projects that the global average will continue climbing, reaching 77.2 years by 2050.
Years Alive vs. Years in Good Health
Not all years of life are equal. The WHO tracks something called healthy life expectancy, which measures how many years a person can expect to live without significant disability or illness. In 2021, the global healthy life expectancy was 61.9 years, compared to total life expectancy of 71.4. That’s a gap of roughly 9.5 years spent living with some form of health limitation.
This gap matters because it reframes the goal. Adding years to life is one thing. Adding healthy, functional years is another. Countries like Japan and Singapore have managed to push healthy life expectancy above 73, meaning their populations spend a smaller fraction of their lives dealing with chronic illness or disability.
Is There a Maximum Human Lifespan?
The average lifespan and the maximum lifespan are two very different questions. While the average hovers around 71, individual humans have lived far beyond that. The verified record for the oldest person ever is 122 years, set by Jeanne Calment of France in 1997.
Whether there’s a hard biological ceiling is still debated. Some researchers have suggested that around 90 years represents a practical upper limit for average life expectancy in any population, given current biology. But as researchers at Harvard have noted, there’s no intellectual reason that ceiling can’t eventually be broken. The distinction matters: even if individual humans occasionally reach 110 or 120, getting the average population lifespan above 90 would require fundamentally slowing the aging process itself, not just curing individual diseases.