Specifically, this question stems from this Wikipedia article on Jeanne Calment, the oldest person to ever live.
"Reflecting her bourgeois background, she considered the most important historical event in her lifetime to have been the Russian Revolution of 1917 and the execution of the Russian imperial family, a view shared by many fellow centenarians."
Here is the book that is cited following this sentence. The Wikipedia article doesn't elaborate any further on the matter. More specifically, why would Jeanne Calment, a French woman, find the Russian Revolution so influential? What is to be said about Russian and French relations in this time period?
You say "centenarians repeatedly", were there more citing this than Calment?