My understanding is the original authors of the blue zone study didn't actually check the number of people aged 90-99. They did look at life expectancy though,

My understanding is the original authors of the blue zone study didn't actually check the number of people aged 90-99. They did look at life expectancy though, which was slightly higher for the blue zones. Not sure how to square that with the new finding of fewer people living 90-99 years.