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What is aging in medical terms? A biological overview

According to the World Health Organization, the proportion of the world's population over 60 years will nearly double between 2015 and 2050. This demographic shift brings a heightened focus on the biological processes behind the fundamental question: what is aging in medical terms? Medically, aging is understood as a complex, time-dependent process of progressive physiological deterioration at the molecular, cellular, and organismal levels.