My maternal grandparents are in their mid 90s and we know that to be true, because aside from the church records, they both have decent memories of the time before WW2 and the event itself. Oddly specific things at that, like prices of goods and salaries from the time.
Also grandpa has 7 siblings, with his older sister already being 100. Interestingly their own parents didn't live nearly that long.
My paternal grandmother on the other hand died one week before turning 97 and only after that it was revealed that she actually lied about her age, claiming to be six years younger, so as to not cause a scandal when my grandparents announced their marriage.
The common theme among them is that they are/were all active working manually and would neither drink nor smoke, but that's no revelation.
Also grandpa has 7 siblings, with his older sister already being 100. Interestingly their own parents didn't live nearly that long.
My paternal grandmother on the other hand died one week before turning 97 and only after that it was revealed that she actually lied about her age, claiming to be six years younger, so as to not cause a scandal when my grandparents announced their marriage.
The common theme among them is that they are/were all active working manually and would neither drink nor smoke, but that's no revelation.