The study underscores that over 80% of India's elderly population is at risk of severe heat stress at 3°C of global warming, with the Indo-Gangetic Plain and Delhi being particularly vulnerable. These regions could experience over 2,000 hours of extreme heat annually, posing significant health risks. Older adults are less capable of regulating body temperature, making them more susceptible to heat-related illnesses. The combined effects of heat and humidity further amplify the danger, especially for low-income elderly individuals who lack access to air conditioning, fans, or adequate healthcare. The study serves as a stark reminder of the disproportionate impact of climate change on vulnerable populations.