consumers to slow or reverse the aging process in the US market generated about $50 billion of revenue a year in 2009. The use of such hormone products has not been proven to be effective or safe. Similarly, a variety of apps make claims to assist in extending the life of their users, or predicting their lifespans.

Average life expectancy and lifespan

During the process of aging, an organism accumulates damage to its macromolecules,

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