study conducted in 1979 in which scientists observed the growth rate of hundreds of people’s fingernails. What they found was that the participant’s fingernail growth rate slowed down by 0.5% annually from the age of 30 onwards. This suggested that if your nails grow faster than this anticipated rate, then you are aging at a slower rate than average. GeneralReference
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Other Health Signs Revealed Through Your Nails
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Your nails can reveal more than your biological age, though. There are several
