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I remember a story (but can't remember the name) where they cloned babies at birth so that they would have spare parts of the correct age.

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But what if I'm born with a disease that ruin my kidneys by the time I'm 18? Both me and my clone will have that disease and will have ruined kidneys, so rendering him useless.

Everyone will have clones, simply borrow one from a friend's clone!

Spares, by Michael Marshall Smith?

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