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How long can humans conceivably2 live? In most de-veloped countries, life expectancy3 has grown steadily toan average of 75 years.But scientists are exploring ways to extend lifespan4 to lengths that seem inconceivable now—perhaps 120 years and beyond.Id
How long can humans conceivably2 live? In most de-veloped countries, life expectancy3 is grown steadily toan average of 75 years.But scientists are exploring ways to extend lifespan4 to lengths that seem inconceivable now—perhaps 120 years and beyond.Id