The Horvath Clock, developed by Dr. Steve Horvath in 2013, is a groundbreaking epigenetic clock that estimates biological age based on DNA methylation patterns. This clock is widely regarded as one of the most accurate and versatile tools for measuring biological aging across different tissues and cell types. The Horvath Clock uses the methylation levels at specific CpG sites (regions of DNA where a cytosine nucleotide is followed by a guanine nucleotide) to estimate an individual’s biological age. Methylation at these sites tends to correlate strongly with chronological age, but it can also reveal biological age, reflecting an individual's health status and aging rate.