Sped-up ‘biological aging’ linked to worse memory

A common type of epigenetic modification is when a molecule called a methyl group is added to DNA. In the image above, the light blue enzyme is “methylating” the DNA by adding the red methyl group. (Image credit: selvanegra via Getty Images)

An internal “clock” attached to a person’s DNA may be a better predictor of age-related memory decline than their actual, chronological age, a new study suggests. 

As people age, they tend to gradually lose the ability to process information and retain memories. How quickly and to what extent this happens differs between individuals, meaning that simply looking at a person’s chronological age is not enough to predict these changes. 

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