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![Pick](https://image.librarything.com/pics/litsy_webpics/icon_pick.png)
Francis Saxover and Diana Brackley discover a compound in a rare lichen that can extend the human lifespan to two hundred years or more. They take different approaches to coping with the inevitable social disruption a limited supply is going to cause.
Not as well known as Wyndham's other books, but still an interesting exploration of ideas.