Over-60s Hit Dangerous Heat at 1.5°C Warming: Lancet
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- Stanford University researchers led a Lancet Public Health study finding adults 60+ face health-threatening heat at far lower temperatures than younger adults, overturning previous models that applied younger-adult heat-balance thresholds to all age groups and thus undercounted older people's risk of heart attacks and other serious outcomes.
- Dr Simon Williams of Swansea University noted older adults risk 'harmful and potentially fatal heat stress' at just 1.5°C of warming above preindustrial levels, compared with 4°C for younger adults.
- Each additional degree of global heating exposes roughly one million more people to at least 180 hours of uncompensable heat stress annually, with the burden falling disproportionately on older adults.
- The world's population aged 60 and over is projected to double to 2.1 billion by 2050, and the source flags low- and middle-income countries such as India and Pakistan as facing disproportionate growth in heat-related harm.
- The UK has already experienced five heatwaves in 2026, with the four-day May heatwave and eight-day June heatwave together causing 2,877 excess deaths — nearly double the 1,504 seen across summer 2025.
- The UK Health Security Agency said it expects 2026 to record Britain's highest-ever annual heat-related death toll, and Caroline Abrahams of Age UK called the new findings 'alarming' and said there is 'now no denying that extreme heat poses a very real health threat to our older population.'
Why it matters: The study redraws the heat-danger map by age: older adults reach harmful heat stress at 1.5°C of warming versus 4°C for younger adults, and with the 60+ population set to double to 2.1 billion by 2050, low- and middle-income countries like India and Pakistan will see disproportionate growth in heat-related harm. The cost is already visible in the UK, where 2026 excess heat deaths have nearly doubled versus summer 2025.
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