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Which theory of aging is most accepted regarding why we age?

Over the past decade, epigenetic clocks have become powerful tools to estimate biological age, highlighting the complexity of human aging. While no single theory completely explains why we age, the most widely accepted perspective combines evolutionary theory with the molecular and cellular 'hallmarks of aging,' which together address the ultimate reasons for aging as well as the proximate mechanisms. A comprehensive understanding of which theory of aging is most accepted regarding why we age requires examining both the foundational evolutionary reasons and the specific cellular pathways involved.