The summer of 2023 was the hottest on record since 1850, and this summer could be just as sweltering. That puts older adults—a group especially vulnerable to heat-related illnesses—at elevated risks for a number of health conditions and outcomes. Older people are less able to regulate changes in body and environmental temperatures, and higher temperatures put them at increased risk of dehydration, heat stroke, blood pressure changes, muscle cramps, and dizziness. These issues are likely to become far more prevalent than they currently are.