Life expectancy is increasing, both globally and in the United States, after a sharp dip caused by the COVID-19 pandemic. In the U.S., life expectancy at birth reached 79.0 years in 2024, up from 78.4 in 2023. Globally, the long-term trend has been dramatic: the average newborn in 1900 could expect to live about 32 years, while by 2021 that number had more than doubled to roughly 71 years. But the picture is more complicated than a single upward line, with major disruptions, persistent gaps between groups, and real questions about whether the pace of improvement can continue.
The Pandemic Set the Clock Back a Decade
Between 2019 and 2021, global life expectancy dropped by 1.8 years, falling to 71.4 years. The World Health Organization described this as wiping out nearly a decade of progress in just two years. That kind of sudden reversal hadn’t happened in modern times, and it hit some countries far harder than others.
The recovery has been swift. In the U.S., life expectancy bounced from 77.5 in 2022 to 78.4 in 2023, then to 79.0 in 2024. Much of that rebound came from the collapse in COVID-19 death rates: the age-adjusted death rate for COVID dropped 73% between 2022 and 2023 alone. Death rates also fell for heart disease (down 3.1%), diabetes (down 7.1%), Alzheimer’s disease (down 4.2%), and kidney disease (down 5.1%). The one major killer that held steady was cancer, where the death rate didn’t change significantly.
Where the U.S. Stands Now
The 2024 CDC data puts U.S. life expectancy at 79.0 years overall. Women live longer, at 81.4 years, compared to 76.5 for men. That 4.9-year gender gap is a persistent feature of longevity data, though it narrowed slightly in 2024 because men’s life expectancy rose by 0.7 years while women’s increased by 0.3.
Even with the recent gains, the U.S. lags well behind the longest-lived populations. Hong Kong leads at 85.5 years, followed by Japan (84.7), South Korea (84.3), and a handful of smaller territories and nations above 84. The U.S. spends far more per person on healthcare than any of these places, which makes its relatively modest life expectancy a source of ongoing debate among researchers and policymakers.
Income Is One of the Strongest Predictors
Where you fall on the income scale has a striking effect on how long you live. A study using 1.4 billion U.S. tax records found that men in the top 1% of income live 14.6 years longer than men in the bottom 1%. For women, the gap is 10.1 years. That’s not a subtle difference. It means two people born in the same country, in the same year, can have life expectancies that differ by more than a decade based largely on their economic circumstances.
This gap reflects differences in access to healthcare, nutrition, housing, environmental exposures, and chronic stress. It also means that national averages can obscure very different realities. A wealthy person in a major U.S. metro area may have a life expectancy that rivals Japan’s, while someone in a low-income rural community may face numbers closer to a developing nation.
What’s Driving the Long-Term Gains
The massive increase from 32 years in 1900 to over 70 today came in stages. Early gains were driven mostly by reducing infant and childhood deaths through sanitation, clean water, and vaccines. In the mid-20th century, antibiotics and better surgical techniques pushed the average higher. More recently, improvements in treating heart disease, stroke, and certain cancers have added years at the older end of life.
The forces currently pulling life expectancy down in the U.S. include drug overdoses (particularly from synthetic opioids), obesity-related diseases like diabetes and heart disease, and chronic liver disease linked to alcohol use. These are categorized under “unintentional injuries” and metabolic conditions in mortality data, and they disproportionately affect working-age adults. The fact that death rates for most of these causes declined in 2023 is encouraging, but they remain elevated compared to pre-2015 levels.
What Projections Show for 2050
The United Nations projects global life expectancy will rise from 72.8 years in 2019 to 77.2 years by 2050. That’s continued progress, but the pace is slower than what the world saw in the second half of the 20th century. The easy gains from reducing childhood mortality have largely been captured in most regions, so future improvements depend more on keeping older adults alive longer, which is biologically harder and more expensive.
Medical advances could accelerate that timeline. Drugs that improve how the body handles blood sugar and weight are already reducing deaths from diabetes and cardiovascular disease. Gene therapies are in early stages for conditions that currently shorten life. Researchers studying caloric restriction in animals have found that reducing food intake by 30% can extend lifespan by roughly 25% in rodents, and the search for a compound that could replicate this effect in humans is an active area of work, though nothing proven exists yet.
The Gender Gap Persists but Is Shifting
Women outlive men in virtually every country on Earth, and this has been true for as long as reliable records exist. In the U.S., the 2024 gap is 4.9 years (81.4 for women versus 76.5 for men). Biological factors play a role: estrogen appears to offer some cardiovascular protection, and having two X chromosomes provides a backup copy of certain genes. But behavioral factors matter too. Men are more likely to die from injuries, substance use, and cardiovascular disease at younger ages.
The gap has actually been narrowing over the past few decades. In the 1970s, U.S. women outlived men by nearly eight years. The convergence is partly because men have reduced smoking at faster rates and partly because some causes of death that disproportionately affect men, like workplace injuries, have declined. The 2024 data continued this trend, with men gaining more than twice as many months of life expectancy as women in a single year.