Organ transplants and immortality: Might Xi and Putin be onto something?

The presidents of China and Russia were overheard discussing transplants as a way to prolong life.

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A translator, speaking in Mandarin on behalf of Putin, told Xi how human organs can be repeatedly transplanted "so that one can get younger and younger" in spite of age, and might even be able to stave off old age "indefinitely".

"It's predicted that in this century it might become possible to live to 150," he added.

Their smiles and laughter suggest it was a bit of banter, but might they be on to something?

Organ transplants certainly save lives - in the UK, over 100,000 people have been saved in the last 30 years, says NHS Blood and Transplant.