A new study discussed by UK media reports that extreme heat may affect human biological ageing. The coverage says that hotter conditions, particularly during heatwaves, can shift the body’s internal clock in a way that corresponds to a faster ageing timeline. One account describes the effect as pushing internal biological timing forward by roughly half a year, suggesting that exposure to very high temperatures may have measurable impacts on physiological processes associated with ageing. The articles frame the finding as a potential additional risk of heatwaves beyond immediate health concerns such as dehydration and heat-related illness. They do not provide details in the supplied text on the study’s methods, participant numbers, or how heat exposure was quantified, nor do they specify whether results apply equally to all age groups or health statuses. Overall, the reports present the study as indicating that extreme heat can influence biological markers of ageing, but further details would be needed to assess how the findings translate to real-world risk and long-term outcomes.