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You have two ages, chronological and biological. Here's why it matters
Essentially, everyone has two ages: a chronological age, how old the calendar says you are, and a phenotypic or biological age, basically the age at which your body functions as it compares to average fitness or health levels. Levine and her team identified nine biomarkers taken in a simple blood test that seemed to be the most influential on lifespan. The biomarkers include blood sugar, kidney and liver measures, and immune and inflammatory measures.
Levine plugs those numbers into the computer, and the algorithm does the rest. People with a biological age lower than their chronological age have a lower mortality risk, while those aging older from a biological standpoint have a higher mortality risk and are potentially more prone to developing the diseases associated with the higher age range.
Source: CNN