Researchers have successfully measured the speed of ageing in wild birds, opening up the possibility of doing the same for humans.
The test allows you to look at the "biological age" of individuals and also accurately predict, major illness aside, their lifespan.
The test measures the average length of tiny structures called telomeres, which are known to get shorter each time a cell divides during an organism's lifetime.
The length of telomeres provide a more accurate estimate of a person's true biological age rather than their actual chronological age.
This has led some experts to suggest that telomere tests could be used to estimate how long they have left to live, assuming they die of natural causes.
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