Aging should be classified as a disease, not an unavoidable fact of life

Sinclair's central provocation is that medicine has arbitrarily treated aging as a background condition rather than a disease in its own right, even though it is the single largest risk factor for most of the conditions that actually kill people — heart disease, cancer, dementia, and more all become dramatically more likely with age.

He argues this classification isn't just semantic. Diseases attract research funding, drug development pipelines, and regulatory pathways for treatment in ways that a mere "natural process" does not, meaning the current medical framing of aging has actively slowed progress on interventions that might delay it.

Sinclair points to the World Health Organization's classification systems and ongoing debates over formally recognizing aging as a treatable condition as evidence this reframing is gaining real traction, not remaining a fringe position, and argues that if aging itself could be delayed, it would delay the onset of essentially every major age-related disease simultaneously — a far more efficient target than fighting each disease separately after the fact.

Takeaway: treating aging as an untreatable fact of life, rather than a disease, has itself been an obstacle to medical progress on delaying it.