Chinese President Xi Jinping and Russia's Vladimir Putin discussed life-prolonging organ transplants and immortality as they chatted before Beijing's massive military parade this week, in comments picked up by state media microphones.

Historic images showed Xi shaking hands and speaking with Putin and North Korean leader Kim Jong Un as they walked down a red carpet by Tiananmen Square, in scenes viewed as a challenge to US President Donald Trump.

"These days... 70 years old," Xi said in Mandarin as he walked beside Putin and Kim, footage from state broadcaster CCTV showed.

Xi's translator, conveying his remarks to Putin, is then heard in Russian quoting a line from a Tang dynasty poem: "In the past, it used to be rare for someone to be older than 70 and these days they say that at 70 on

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