Aging is a process of damage accumulation in cells and tissue structures, followed by reactions to that damage, some of which are compensatory and some of which make matters worse, and lastly the consequent failure of biological systems necessary to support health and life. Age-related diseases are names we give to some of the aspects of system failure, but they are not distinct from aging. One cannot draw a line between aging and age-related disease; it is a futile endeavor, and that the medical industry and regulatory bodies are set up to do so is one of the major challenges facing those who want to develop commercial rejuvenation therapies based on clearance of senescent cells or other recent scientific advances.
This point about aging and age-related disease is somewhat reinforced by the genetic analysis noted here, though I’m yet to be convinced of the utility of this sort of research beyond gaining a purely curiosity-driven scientific understanding of how aging progresses in detail. Since we all age for the same reasons, the same underlying damage, and since rejuvenation therapies will repair that damage in the same way in all patients, and since we have a good
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