what is Horvath’s clock ?
An epigenetic clock is a type of DNA clock based on measuring natural DNA methylation levels to estimate the biological age of a tissue, cell type or organ. A pre-eminent example for an epigenetic clock is Horvath’s clock, which is based on 353 epigenetic markers on the human genome.
Prof Steve Horvath is an german scientist, who is the inventor of a time measuring instrument- so called Horvath`s clock. Elemental wise you need not a instrument or machine. This clocks based on an gene- analysis, dissection
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about aging you can read here, link