Above the world average after WW2 was easy to achieve for countries that had not been bombed to oblivion, and in the case of the USSR, that had basically conquered Eastern Europe
Ur meme gives the impression that USSR and PRC communism is good for health. I'm raising a counterpoint while attempting to maintain the tone of the meme.
First, Russia and China are not communist. They are both dictatorships. Medical advances in all first world countries is the reason for life expectancy to rise.
Africa and South America have been prevented from improving medical care which in combination with the above accounts for Russia and China rising above the average.
If India went the path of the chinese in 1955 instead of democratic capitalism i think they would have had the same results as China today. You could argue China has been also prevented from
improving medical care until the communist party stopped letting it happen.