Key pieces of DNA called telomeres, which indicate the ability of cells to replicate, are also linked to how young a person looks.
" Perceived age, which is widely used by clinicians as a general indication of a patient's health, is a robust biomarker of ageing that predicts survival among those aged over 70 . " The report authors.
A telomere of shorter length is thought to signify faster ageing and has been linked with a number of diseases.
In the study, the people who looked younger had longer telomeres.
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