Heat waves could be aging us faster at the cellular level

A USC-led study analyzing data from more than 3,600 adults (56+) finds exposure to extreme heat, defined by heat index levels from the National Weather Service, accelerates biological aging as measured by epigenetic clocks. Participants in hot, humid regions showed up to about 14 extra months of aging, and clocks indicated 1–6 years of accelerated aging, with older adults at higher risk; findings underscore potential health and policy implications amid warming climates.