Global heatwaves are escalating due to climate change, posing significant health risks, especially for older adults. A recent analysis highlights major heat events in regions like the Middle East, Southern Asia, Central America, Australia, and Europe, characterized by extreme temperatures and high mortality. The study introduces the concept of 'non-survivable days,' where older individuals face high heat stress risks in direct sunlight. Researchers used the HEAT-Lim model to assess heatwave impacts, revealing that current models may underestimate heat stress effects, even when not exceeding the 35°C wet-bulb temperature threshold.