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Extreme heat may a harsher effect on older people than doctors previously . Researchers from Stanford University in the USA have said that the body's tolerance for heat in older people. They added that the continuing rise in global temperatures could a serious risk of illness or death for those aged 60 and over. The threat of rising temperatures to the health of the over-60s has been seriously . The researchers said heatwaves will millions of older people at risk of a condition uncompensable heat stress. This is when the body its ability to cool itself. This can serious damage to the body and can even to death.

The researchers warned: "Intolerable heat will experienced at much larger scales and for longer durations, affecting far more people than previously ." They said the over-60s at a higher risk because of three physical factors — they less, their hearts have to work harder in the heat, and their blood vessels more slowly. These three things the ability of the body to cool itself. A director at the charity Age UK said she found the conclusions in the study alarming. She said: "This study means there's now no that extreme heat a very real health threat to our older population." Elderly people in low-income countries likely to at highest risk.