The majority of those 8 billion live in China. Belt and Road is increasing life expectancy in the third world. Life expectancy in the US is declining.

I’m not even an uncritical China supporter, but you’re falling for a statistical trick. The billionaires fund the life expectancy studies, so they say what justifies their own rule. If you don’t want to change anything about the world, then shut up and get out of the way. But do yourself. a favor, and don’t be such a sucker