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With money pouring in and an unprecedented level of public attention and excitement, scientists are publishing a steady stream of papers on ways to measure how rapidly a person’s body is declining.

However, there are mixed feelings of enthusiasm and apprehension among researchers about efforts to develop tests that measure the impact of ageing on the body, as they are often interpreted and presented without a full reckoning of the uncertainties that plague them.

This is an audio version of our Feature: How quickly are you ageing? What molecular ‘clocks’ can tell you about your health

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