Women live longer than men nearly everywhere in the world. Globally, life expectancy at birth is 74.2 years for women and 69.8 years for men, a gap of about 4.4 years. In the United States, the most recent data from 2024 puts life expectancy at 81.4 years for women and 76.5 years for men, a difference of 4.9 years. This gap has persisted for as long as reliable records have existed, and it stems from a combination of biology, genetics, and behavior.
Current U.S. Life Expectancy Numbers
As of 2024, overall life expectancy in the United States is 79.0 years. Women can expect to live to about 81.4, while men reach about 76.5. Both figures climbed from 2023, with men gaining 0.7 years and women gaining 0.3 years. That narrowed the gender gap slightly, from 5.3 years in 2023 to 4.9 years in 2024.
These numbers reflect a rebound from the COVID-19 pandemic, which hit men harder. Male life expectancy dropped more steeply during 2020 and 2021, and it has been recovering faster since then. Still, the gap remains wider than it was before the pandemic.
If you’ve already reached 65, the picture shifts a bit. According to Social Security Administration life tables, a 65-year-old man can expect to live roughly 17.5 more years (to about 82.5), while a 65-year-old woman can expect about 20 more years (to about 85). Surviving to 65 means you’ve already avoided many of the causes of early death that drag down the average, so remaining life expectancy at that age is more generous than the birth figures suggest.
Why Women Live Longer: The Biological Edge
Estrogen gives women measurable cardiovascular protection during their reproductive years. The hormone relaxes and widens blood vessels, improves the function of the vessel lining, and suppresses inflammation in artery walls. It dials down key inflammatory signals, including C-reactive protein and tumor necrosis factor, both of which drive the buildup of arterial plaque. It also limits the overgrowth of smooth muscle cells inside injured arteries, a process that is significantly more pronounced in males. The net result: premenopausal women develop heart disease at far lower rates than men of the same age.
After menopause, when estrogen levels fall, women’s cardiovascular risk rises and begins to converge with men’s. But the decades of protection still add up. Heart disease remains the leading cause of death for both sexes, and men develop it earlier and more aggressively on average.
The Genetic Backup Plan
Women carry two X chromosomes; men carry one X and one Y. That second X acts as a kind of insurance policy. If a gene on one X chromosome is faulty, the copy on the other X can compensate. Men don’t have that backup for X-linked genes.
The X chromosome is also unusually rich in genes that affect the brain, carrying the highest density of brain-related genes of any chromosome. Researchers at UC San Francisco identified a gene called KDM6A on the X chromosome that appears to boost cellular resilience. About 15% of genes on the “silenced” second X chromosome actually escape that silencing, meaning women’s cells produce higher levels of certain protective proteins. In animal studies, increasing levels of the KDM6A protein in male cells made them more resilient to stress and improved spatial memory. Analysis of genetic databases has also linked a variant that raises KDM6A levels in the brain with slower cognitive decline in Alzheimer’s disease.
Behavioral Differences That Widen the Gap
Biology doesn’t explain the entire 4 to 5 year difference. Men are more likely to smoke, drink heavily, and work in physically dangerous occupations like construction, mining, and transportation. They have higher rates of death from accidents, homicide, and suicide across nearly every age group. These behavioral patterns vary by country and era, which is one reason the size of the gender gap shifts over time and across cultures.
Men also use preventive healthcare far less often. CDC data shows that women make about 76.6 preventive care visits per 100 people annually, compared to just 45.4 for men. That’s a 69% higher rate for women. The disparity is especially stark among younger adults: men aged 18 to 44 are far less likely to see a doctor when nothing feels wrong. Skipping routine checkups means conditions like high blood pressure, high cholesterol, and early-stage cancers go undetected longer in men, which contributes to worse outcomes down the line.
How the Gap Is Changing
The gender gap in life expectancy has not been constant. In the mid-20th century, when male smoking rates were extremely high relative to women’s, the gap in the U.S. stretched to nearly 8 years. As smoking rates converged and treatments for heart disease improved, the gap shrank. By the early 2010s it had narrowed to about 4.8 years before widening again during the pandemic.
Global projections suggest the gap will continue to narrow. The Institute for Health Metrics and Evaluation forecasts that between 2022 and 2050, global male life expectancy will increase by 4.9 years while female life expectancy will rise by 4.2 years. In other words, men are expected to gain ground, though women will still live longer overall. The shift is driven largely by reductions in infectious disease, better access to healthcare in low-income countries, and declining smoking rates among men worldwide.
What This Means at Different Ages
Life expectancy at birth is a population average, and it can be misleading if you take it too personally. It’s heavily influenced by deaths in infancy and young adulthood, which disproportionately affect males. A man who reaches 40 without a serious health condition has already beaten many of the risks baked into that average and can reasonably expect to live well beyond 76.
Your individual life expectancy depends far more on specific factors: whether you smoke, your blood pressure, your weight, how much you move, and your family history. The gender gap is real and rooted in biology, but it’s a statistical tendency across millions of people, not a fixed ceiling. Men who stay on top of preventive care, manage cardiovascular risk factors, and avoid tobacco close much of the gap on their own.