Want to live longer? For centuries the attempt to stop ageing was the preserve of charlatans touting the benefits of mercury and arsenic, or assortments of herbs and pills, often to disastrous effect. Yet after years of false starts, the idea of a genuine elixir of longevity is taking wing. Behind it is a coterie of fascinated and ambitious scientists and enthusiastic and self-interested billionaires. Increasingly, they are being joined by ordinary folk who have come to think that the right behaviour and drugs could add years, maybe decades, to their lives.
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