Summary :
Lifespan has three parts: "Part I: What We Know (The Past)" – contains 3 chapters "Part II: What We're Learning (The Present)" – contains 4 chapters "Part III: Where We're Going (The Future)" – contains 2 chapters The book also contains an introduction and conclusion. The authors begin by seeking to characterize how professionals view the hallmarks of aging, including genomic instability caused by DNA damage; alterations to the epigenome that controls which genes are turned on and off; loss of healthy protein maintenance, known as proteostasis; exhaustion of stem cells; and the production of inflammatory molecules. "Address one of these, and you can slow down aging," the authors argue. "Address all of them, and you might not age."

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