That argument only applies if these notional immortals are also invincible, and therefore impervious to accident. But that is an odd definition, and not one that crops up very often, especially in scientific research into ageing. The holy grail there is simply to arrest the ageing process. Indeed, Mr Cave quotes an actuary who has estimated that the average "medical immortal" would persist for around 6,000 years before dying in a plane accident or a car crash or the like. And besides, boredom seems to be a non-problem: after all, if an immortal does ever get truly bored of his vastly extended life, there would be nothing to prevent him from ending it.
然而,这种见解能够成立的前提是:这些假想的长生不老者同时也是刀枪不入者,因而不会被任何事故所损伤。但这种前提是难以成立的,特别是与研究老化的科学成果相悖。这种科学的目的仅仅是延缓老化。确实,卡夫先生引用了一位精算师的估算结果:即使在医学意义上能够长生不老的人,平均寿命大约也只有六千年,因为他们也终会由于飞机失事或汽车事故而死去。此外,厌倦看起来不是什么问题:假如一个长生不老的人实在由于活得太长而厌倦了,他随时可以结束自己的生命嘛。
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