Brainless bodies and pig organs: does science back up Putin and Xi’s longevity claims?

Russian leader's claim that people can get younger' through repeated organ transplants has raised eyebrows

Perhaps it was the extravagant display of deadly weaponry that prompted Xi Jinping and Vladimir Putin to mull on mortality at this week's military parade in Beijing.

It was more banter than serious discussion, but with both aged 72, the Chinese president and his Russian counterpart may feel the cold hand on the shoulder more than Kim Jong-un, the 41-year-old North Korean leader who strolled beside them.