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Mitch McConnell, the 77-year-old Senate majority leader, is already past the U.S.-male life expectancy. If the country were to deem, say, the Social Security retirement age of 66 as the mandatory cutoff for a career in politics, it would amount to a total overhaul of government. It would eliminate not just the top four presidential candidates, but much of Congress.
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Earlier this year, ophthalmologists at Northwestern University Feinberg School of Medicine similarly suggested that better detection might be accomplished by taking pictures of our eyes. At the back of the eye sits a delicate nest of capillaries whose status can be a window into what’s happening in the blood supply to the brain. Still, the appearance of our retinas or brain is a secondary indicator—a proxy for what really matters, our current ability to think.

https://www.theatlantic.com/health/archive/2019/11/kings-speech/602050/

Our government situation is unprecedented in human history.