There is an observation that donated organs sync to a biological age of the recipient.
https://www.inc.com/lucia-auerbach/can-transplanted-heart-be...
So in theory you could keep an organ alive perpetually if you kept transplanting it every fifty or so years?
Yeah, this had me thinking. Does transplanting older organs into younger bodies force the body to rejuvenate the transplanted organ to the recipients age.
Edit: your article say so, neat.