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Hallmarks of Aging
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# Hallmarks of Aging Portal: Longevity Science Stage: Established framework Evidence: Early human Template: Concept Risk: Unknown Reversibility: Context dependent Last reviewed: Jun 2026 == Summary == A shared framework that organizes aging into interconnected biological processes, giving longevity research a common map of what to measure and target. == Key takeaways == * The hallmarks describe categories of age-related damage and dysfunction, not a single cause of aging. * They are interdependent: intervening on one hallmark often shifts several others. * The framework is a research organizer, not a validated set of clinical targets. == The framework == The hallmarks of aging group the biology of aging into categories such as genomic instability, telomere attrition, epigenetic alteration, loss of proteostasis, deregulated nutrient sensing, mitochondrial dysfunction, cellular senescence, stem-cell exhaustion, altered intercellular communication, and, in later revisions, disabled autophagy, chronic inflammation, and dysbiosis. The value of the framework is coordination. It lets separate labs describe interventions in a shared vocabulary and ask whether a treatment addresses a primary driver of damage or a downstream consequence. == Why it is useful and where it misleads == Because the hallmarks are interconnected, a clean single-target story is rare. Senescence feeds inflammation; nutrient sensing shapes proteostasis and mitochondrial quality. Useful interventions often touch several hallmarks at once, which complicates attribution. The framework can also mislead when a hallmark is treated as a goal in itself. Reducing a marker of a hallmark does not guarantee improved function or lifespan, and the categories were defined from observation rather than from a predictive theory of aging. == Open questions == * Which hallmarks are upstream drivers versus downstream readouts? * Can targeting a single hallmark produce durable functional benefit in humans? == Watchlist == * Composite functional endpoints * Cross-hallmark interventions * Aging biomarkers validation == References == * The Hallmarks of Aging — López-Otín et al., Cell, 2013. https://pubmed.ncbi.nlm.nih.gov/23746838/. Original framework defining the nine hallmarks of aging. * Hallmarks of aging: An expanding universe — López-Otín et al., Cell, 2023. https://pubmed.ncbi.nlm.nih.gov/36599349/. Updated framework adding hallmarks and refining interdependence. == Categories == [[Category:Longevity Science]] [[Category:aging biology]] [[Category:geroscience]] [[Category:frameworks]]