Submission + - Old Hearts Become Biologically Younger When Transplanted Into Younger People (sciencealert.com)
But a new preprint, uploaded to bioRxiv and yet to be peer-reviewed, suggests that this may only be true up to a point. Take the heart out of the body and put it in a new one, and something incredible happens.
The transplanted heart begins to take on the biological age of its new owner.
Older hearts transplanted into younger recipients appear to become biologically younger, while younger hearts placed in older bodies show signs of accelerated aging.