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Biological age, as opposed to chronological age, is driven by the intrinsic processes of primary aging, the accumulation of molecular damage outlined in the SENS rejuvenation research proposals, but also by the influence of the environment, secondary aging. The important contributions to secondary aging are excess visceral fat tissue as a consequence of diet, burden of infectious disease, lack of exercise, and smoking, acting through a range of mechanisms that overlap with the intrinsic processes of primary aging. There are others, but their effects are smaller and it is harder to see them in the data in comparison to the points above.

primary agingaccumulation of molecular damageSENS rejuvenation research proposalssecondary agingexcess visceral fat tissueburden of infectious diseaselack of exercisesmoking

In the paper here, researchers make an effort to map recent changes in secondary aging, picking combinations of metrics from past data that might offer insight into the biological age of patients. I would say that there is little reason to expect primary aging to have altered significantly in the past few decades, given the landscape of medical technology, but it is certainly up for debate as to whether medications that control blood pressure and cholesterol levels might have some effect. They have

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