U.S. life expectancy has roughly doubled since 1776, experts say
Average lifespan in the United States has risen from about 35-40 years in the late 18th century to roughly 79 years today, driven by improvements in sanitation, vaccination, antibiotics and chronic disease treatment, while modern challenges include obesity, substance abuse and COVID-19.
The average age at death for Americans is now about 79 years, up from an estimated 35-40 years when the nation was founded in 1776, according to CDC data. Researchers attribute the increase largely to lower infant, childhood and maternal mortality and to advances in sanitation, clean water, nutrition, vaccination and medical care.
"Much of this vast discrepancy is related to the extremely high rates of infant, childhood and maternal mortality," said Dr. Omer Awan, a physician and professor at the University of Maryland School of Medicine. He added that safer childbirth, antibiotics and vaccines have dramatically reduced deaths from diseases such as measles, smallpox and pneumonia.
Public-health historian Mia Kazanjian noted that 19th-century developments like municipal water systems, sewer networks and indoor plumbing reduced water-borne infections, while the acceptance of germ theory and federal quarantine and food-safety laws further curbed epidemics. The introduction of vaccines beginning with Jenner’s smallpox vaccine in 1796 and the widespread use of antibiotics from the 1940s onward also contributed to rising longevity.
From the mid-20th century onward, better prevention and treatment of high blood pressure, heart disease and stroke, anti-smoking campaigns, safer automobiles and advances in emergency and trauma care continued to push life expectancy upward. By 1950 the average reached about 68 years, and it climbed to roughly 79 years in the 2010s.
Today, experts say the focus has shifted from surviving infectious diseases to preventing chronic conditions. Dr. Nneoma Oparaji highlighted that the next challenge is extending healthy life years, while Kazanjian pointed to recent setbacks caused by opioid overdoses, suicides, alcohol-related deaths and the COVID-19 pandemic, which lowered life expectancy by more than two years between 2019 and 2021.
Obesity, especially among children, remains a growing concern, contributing to higher rates of cardiovascular disease, diabetes, cancer and even rising incidences of certain cancers in younger adults. Researchers emphasize that improving lifestyle factors will be key to sustaining the gains in longevity.
