Chinese leader Xi Jinping and Russia President Vladimir Putin chatted about how advances in science could prolong the human life span in a rare hot mic moment in the Chinese capital.

The brief exchange was captured on a live news video feed of Xi and Putin as they walked on a red carpet with North Korean leader Kim Jong Un at the head of a large cluster of high-level guests. The group was going toward the viewing platform for a major Chinese military parade on Wednesday.

Xi spoke first, and although only parts of his words can be made out, a translator followed in Russian: “Before it’s said to be very rare to live up to 70, and now it’s said that you are still a child at 70.”

Both leaders are 72 years old.

Putin, turning toward Xi, gesticulated with pointed fingers as he responded. Kim

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