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What is the molecular clock theory of aging?

Scientists have observed for over a decade that patterns of DNA methylation can accurately measure an individual’s age, leading to the development of “epigenetic clocks”. The **molecular clock theory of aging** is not a single, unified theory but rather a concept that uses these quantifiable molecular changes, primarily epigenetic modifications, to track biological age and health status across different species. This biological clock, distinct from chronological time, offers profound insights into the underlying mechanisms of aging and potential interventions.