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Are Lifespan and Healthspan Strongly Coupled?

Lifespan is length of life, while healthspan is length of healthy life. Are they strongly coupled? Is it possible to arrive at treatments that greatly alter one without much altering the other? A related concept is something that many researchers believe (or at least claim in public) that they are aiming for: compression of morbidity, in which healthspan is extended without lifespan being extended.
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