Gerontology: Will you still need me, will you still feed me?

Lorna Stewart quizzes young researchers John Lee, Claudine Gauthier and Alina Solomon about what they think happens as our bodies age. “What is the life expectancy of the world population today?” asks Hans Rosling, a global-health researcher at the Karolinska Institute in Stockholm, during the opening ceremony of this year's Lindau Nobel Laureate Meeting.

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