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The problem is histological compatibility, i. e. not getting it ruined by the recipient's immune system. The TFA was very lucky having apparently 100% compatibility.

Speaking strictly theoretically, I don’t think “young” environment can help with telomere shortening.

Well the average kidney transplant works for 15-20 years... so probably not.

That’s not how causation works.

People with infection and or endocrine failure who need an organ are more apt to need another organ (due to age - or endocrine failure again).