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Are there any life extension technologies at all, assuming an already healthy person? The only one I'm aware of that's definitely effective is caloric restriction, and last I heard that was only proven in smaller creatures and not confirmed in humans.

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Exercise extends your life. I think this would qualify since you'd be considered healthy if you exercise a moderate amount, but if you exercise more than a moderate amount, it further increases longevity.

See: https://www.health.harvard.edu/blog/can-exercise-extend-your...

(Not sure if exercise counts as a "technology", though. Maybe exercise equipment does.)

A good place to start is Outlive. It's less technology, more lifestyle. https://peterattiamd.com/outlive/

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