The average human life expectancy globally is about 71.4 years as of the most recent World Health Organization data. In the United States, it reached 79.0 years in 2024, the highest figure ever recorded for the country. These numbers vary widely depending on where you live, your sex, your income, and your daily habits.
Global Life Expectancy Today
The WHO’s most recent complete estimate puts global life expectancy at 71.4 years, a figure that actually represents a decline from pre-pandemic levels back to where the world stood in 2012. Of those 71.4 years, only about 61.9 are spent in good health, a measure known as “healthy life expectancy.” That gap of roughly 9.5 years represents time typically lived with chronic illness, disability, or significantly reduced quality of life.
The leading killers driving these numbers are largely preventable. Heart disease alone accounts for 13% of all deaths worldwide. Stroke causes another 10%, and chronic lung disease about 5%. Lower respiratory infections remain the deadliest communicable disease globally. These conditions collectively shape the ceiling on how long most people live.
Life Expectancy in the United States
The U.S. hit a record 79.0 years in 2024, up 0.6 years from 78.4 in 2023. Women live longer on average: 81.4 years compared to 76.5 for men. That rebound follows sharp declines during the pandemic years, and the number is still climbing.
Despite that record, the U.S. lags behind nearly every other wealthy nation. Among comparable high-income countries, the average is 82.7 years. Japan reaches 84.1, Switzerland 84.2, and Sweden 83.8. Even close neighbors like Canada (82.2) and cultural peers like the United Kingdom (81.3) outpace the U.S. by multiple years. Higher rates of gun violence, drug overdose deaths, obesity, and uneven access to healthcare all contribute to that gap.
Why Women Live Longer Than Men
The roughly five-year gap between male and female life expectancy isn’t just a cultural pattern. It has deep biological roots. Women carry two X chromosomes, which provides a backup: if one X chromosome has a harmful genetic mutation, the second copy can compensate. Men, with only one X and one Y, have no such safety net. The Y chromosome also develops mutations more frequently than the X.
Estrogen plays a protective role in heart health, which helps explain why women develop heart disease later in life than men. Body size matters too. Across many species, larger animals tend to die younger than smaller ones, and men are on average larger than women. Even before birth, the odds are slightly tilted: male fetuses are less likely to survive in the womb, and developmental disorders are more common among boys. On the behavioral side, the part of the brain responsible for judgment and impulse control develops more slowly in young men, contributing to higher rates of accidents and risk-taking in early adulthood.
How Much Genetics Actually Matters
Your genes influence your lifespan less than you might think. Twin studies estimate that genetics account for only about 20 to 30% of how long you live. The remaining 70 to 80% comes down to environment, behavior, and luck: what you eat, whether you exercise, how much stress you carry, your exposure to pollution, and the quality of healthcare available to you.
Genetics does become more important at the extremes. For people who survive past 85, the heritability of longevity rises to about 40%. In other words, reaching a very advanced age requires some genetic advantage. But for most people, lifestyle choices have a far greater impact than their DNA on whether they reach the average lifespan or exceed it.
Income and Life Expectancy
Few factors predict lifespan as powerfully as money. In the United States, the richest men live 15 years longer than the poorest men. For women, that gap is 10 years. These are not small differences. Fifteen years is the distance between dying at 72 and dying at 87, between meeting your grandchildren and never seeing them born.
Higher income correlates with better nutrition, safer neighborhoods, less physically demanding work, lower chronic stress, and greater access to preventive healthcare. It also correlates with education, which independently shapes health decisions. This income-longevity link helps explain why the U.S., despite spending more on healthcare than any other country, still falls behind nations with stronger social safety nets and more equitable access to basic services.
How Life Expectancy Has Changed Over Time
In 1900, the average American could expect to live to roughly 47. Today that number is 79. That jump of more than 30 years happened in just over a century, driven primarily by reductions in infant and child mortality. Clean water, sanitation, vaccines, and antibiotics eliminated many of the infectious diseases that once killed children before their fifth birthday. When fewer people die young, the average shoots up dramatically.
Improvements in adult longevity have been more modest but still significant. Better treatment for heart disease, cancer screening, and management of chronic conditions like diabetes have pushed the upper end of the curve further out. The gains have slowed in recent decades, though. Most of the “easy” wins, like preventing childhood infections, have already been captured in wealthy countries. The remaining challenges, such as obesity, mental health crises, and drug-resistant infections, are harder to solve at scale.
The Gap Between Living and Living Well
Total life expectancy tells you how many years you can expect to be alive, but it doesn’t tell you how many of those years will feel worth living. The WHO tracks healthy life expectancy separately, and globally that number sits at just 61.9 years. The difference, nearly a decade, is spent dealing with conditions like arthritis, heart failure, dementia, diabetes complications, or limited mobility.
This distinction matters for planning. If you’re thinking about retirement, caregiving, or your own aging, the relevant number isn’t just when you’re likely to die. It’s when your health is likely to decline enough to change how you live day to day. For most people, that transition begins in the early to mid-60s, though regular physical activity, maintaining social connections, and managing blood pressure and blood sugar can push it later.