The article that was referenced in post #19 does give some indication of a limited immunity to some people born before 1957.... and it explains the reasoning... (and it sounds plausible). But, that’s different than the immunity by those who did go through the 1918 flu pandemic...
I follow the immunity issue and there are probably some with a natural version without any exposure.
Still think it’s a lot of media hype too. More imminent doom.