U.S. life expectancy has hit the highest mark in American history. The Centers for Disease Control and Prevention on Thursday reported that life expectancy rose to 79 years in 2024. It’s the result of the dissipation of the COVID-19 pandemic — and also waning death rates from all of the nation’s top killers, including heart disease, cancer and drug overdoses. Preliminary statistics suggest a continued improvement in 2025. Life expectancy is an estimate of the average number of years a baby born in a given year might expect to live, given death rates at that time. It's a fundamental measure of a population’s health.