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However, evolutionary models describe aging as an emergent consequence of declining selection gradients and life-history trade-offs rather than as a deviation from species-typical function. Comparative data across taxa reveal substantial heterogeneity in aging trajectories, challenging the assumption of a uniform pathological pattern. At the molecular level, processes often described as \u201challmarks of aging\u201d reflect conserved regulatory mechanisms whose effects are context-dependent and do not consistently align with criteria used to define diseases. Likewise, epigenetic clocks capture molecular signatures that track biological aging and predict mortality risk, yet these biomarkers reflect time-dependent molecular remodeling rather than an underlying pathological process. While translational research aimed at extending healthspan has generated important advances, current empirical evidence does not support equating aging with disease in a strict biological sense. Even though the classification of aging is not relevant to the importance of investing in aging research to alleviate its burden, maintaining a clear conceptual distinction between time-dependent biological remodeling and pathological dysfunction may provide a more coherent basis for both scientific inquiry and therapeutic development.<\/jats:p>","DOI":"10.1007\/s10522-026-10422-3","type":"journal-article","created":{"date-parts":[[2026,3,23]],"date-time":"2026-03-23T14:23:06Z","timestamp":1774275786000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Aging is not a disease: an evolutionary and comparative biological reappraisal"],"prefix":"10.1007","volume":"27","author":[{"given":"Bruno C\u00e9sar","family":"Feltes","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,3,23]]},"reference":[{"key":"10422_CR1","unstructured":"The World Health Organization (2025) Ageing and health. https:\/\/www.who.int\/news-room\/fact-sheets\/detail\/ageing-and-health"},{"key":"10422_CR2","doi-asserted-by":"publisher","first-page":"243","DOI":"10.1038\/s41574-021-00626-7","volume":"18","author":"JA Amorim","year":"2022","unstructured":"Amorim JA, Coppotelli G, Rolo AP et al (2022) Mitochondrial and metabolic dysfunction in ageing and age-related diseases. 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