#1: developing anti-aging therapies is one example of an ambitious technical project of the type we'd see more often in a less stagnant society.
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#2: extended healthy (and perhaps fertile) lifespans would reduce some of the harms of a graying society. Longer working lives, lower health care costs. Combined with entitlement reform, it could prevent the crisis of too many sick old people supported by too few working adults.
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#3: extended healthy lifespans would further enable gerontocracy.
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#4: The Western lifecycle is currently something like "childhood, adolescence/young-adulthood, parenthood, old age." Add 20 years more of healthy life, and we'll have a new life stage.
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Not sure how that'll play out. The "mature post-kids adult"? (like being 60 for 20 years). The "pre-kids adult"? (like being 30 for 20 years and having first kids at 50). The "second family"? (raise kids to 18 then have more?)
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Avg age of NIH grant recipients