Older adults are more vulnerable to heat due to reduced sweating, slower blood‑vessel response, and increased heart strain.
Heat risk begins at lower temperatures for older people compared with younger adults.
Three degrees Celsius of warming could expose 1.48 billion older people in India, China, Pakistan, Bangladesh and nearby regions.
The dangerous heat could last for about three months, affecting both day and night.
Earlier studies underestimated the risk because they only looked at young, healthy adults.
Using age‑specific heat‑tolerance data helps create better safety plans.
If the planet warms by three degrees Celsius, about 1.5 billion older people in South Asia and the Persian Gulf could face dangerous heat for around three months each year.
Previous research used data from young adults, so it missed many older people who are actually at risk.
Scientists suggest using age‑specific information to better protect older people from heat.
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