The age on your driver’s license may not be the same age as the cells in your body. Scientists use something called an epigenetic clock, which looks at certain chemical tags in DNA to measure your biological age, or how fast your body is actually aging. This can differ from your chronological age, the number of years you have been alive. In a study published in Nature Aging, researchers examined whether changes over time in the biomarkers used for epigenetic clocks could improve the prediction of mortality risk.

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