We've been able to replace organs for a while now - even after growing them in other living things and our own bodies. That could soon be a thing of the past as we start to understand how our organs actually age and accumulate damage.
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Harvard scientists reverse the ageing process in mice – now for humans
Harvard scientists were surprised that they saw a dramatic reversal, not just a slowing down, of the ageing in mice. Now they believe they might be able to regenerate human organs
"Scientists claim to be a step closer to reversing the ageing process after rejuvenating worn out organs in elderly mice. The experimental treatment developed by researchers at the Dana-Farber Cancer Institute, Harvard Medical School, turned weak and feeble old mice into healthy animals by regenerating their aged bodies."