Editorial · Reference
The Longevity Code · The Framework
The canonical scientific framework describing the biological features of aging. Twelve hallmarks — the most-cited reference in longevity research, and the map The Longevity Code is built around.
The Framework
One map. Twelve features.
In 2013, a team of biologists proposed a unifying framework for understanding the biology of aging — nine cellular and molecular processes that appear consistently across organisms, tissues, and decades of research. In 2023, the framework expanded to twelve. The Hallmarks of Aging remain the most cited reference in longevity science — the shared vocabulary by which researchers, institutions, and serious frameworks describe how the body changes over time.
The Source
The Hallmarks of Aging framework was first proposed by López-Otín, Blasco, Partridge, Serrano, and Kroemer in a landmark 2013 paper published in the journal Cell. The framework synthesized decades of aging research into nine integrated hallmarks. A decade later, the same authors published an expanded edition adding three more — bringing the total to twelve.
López-Otín C, Blasco MA, Partridge L, Serrano M, Kroemer G. The Hallmarks of Aging. Cell. 2013;153(6):1194–1217.
López-Otín C, Blasco MA, Partridge L, Serrano M, Kroemer G. Hallmarks of aging: An expanding universe. Cell. 2023;186(2):243–278.
The research referenced on this page was conducted independently and did not involve Codeage products. References are provided for educational context.
The Twelve
Each hallmark describes a biological feature consistently observed across aging research. Together they form the shared map by which longevity science orients its questions.
The accumulation of damage to DNA over time. Cells experience continuous genetic insults from internal metabolism and environmental exposures. The capacity to detect and repair this damage is studied as a foundational feature of cellular aging.
Telomeres are protective sequences at the ends of chromosomes. The literature has consistently described their progressive shortening across cell divisions as one of the most studied features of cellular aging.
Patterns of gene expression — what genes are read, when, and in which cells — have been observed to shift with age. The epigenome is one of the most actively developing areas of contemporary longevity science.
Proteostasis is the cellular network that maintains the proper folding, transport, and turnover of proteins. Its gradual decline with age is a central theme in proteomic aging research.
Autophagy is the cellular process by which damaged components are recycled and reused. Reduced autophagic capacity with age has been described as one of the most studied themes in longevity biology.
Signaling pathways including mTOR, AMPK, and insulin/IGF-1 sense and respond to nutrient availability. Shifts in their balance over time are central to research connecting nutrition and aging biology.
Mitochondria generate cellular energy. Changes in their efficiency, biogenesis, and quality control with age are among the most extensively studied features of cellular biology.
Some cells lose the ability to divide and remain metabolically active. The biology of these senescent cells is one of the most actively developing areas of contemporary longevity research.
The body relies on populations of cells capable of self-renewal to maintain tissues throughout life. Changes in these reserves over time are a foundational subject of regenerative biology.
Cells communicate through hormones, cytokines, neurotransmitters, and extracellular signals. Shifts in these networks over time shape how the body's systems coordinate as an integrated whole.
Persistent low-grade inflammation is one of the most extensively studied features of aging biology. The interplay between immune activity and tissue maintenance is a central focus of contemporary research.
The composition of microbial communities — particularly in the gut — has been observed to shift with age. The relationship between the microbiome and systemic biology is an actively developing area of longevity science.
The Framework
The Hallmarks of Aging do not prescribe a response. They describe the biology. They are the shared vocabulary research uses to ask better questions, design better studies, and locate where in the body aging is unfolding. The framework is the map. It does not draw the route.
The Response
The Longevity Code by Codeage is an answer the framework asks for — four pillars, each mapped to a region of the hallmarks, together covering the biology longevity research describes.
The Longevity Code · Architecture
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Explore →Editorial · Reference
The Hallmarks of Aging are how research describes the biology.
They are the shared map of cellular, systemic, and structural features observed across decades of longevity science. They are not a prescription. They are a description.
What the science describes, The Longevity Code is built around.
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