I started running various scenarios with FireCalc, and plotting them on an Excel table, back in 2012, when I was 42. Back then, I used the age of 100.
However, that would give 58 year spans, which meant the most recent cycle meant starting around 1953 and ending in 2011. So, just to test a bit further, I'd also run shorter spans, to see what might happen. For instance, around 1965-66 wasn't such a great year to retire. And as the front page of FireCalc shows, neither was 1973. And I also have a feeling that around 1999-2000 might have been a bit iffy, as well.
Now I'm 52, which means I only have to worry about a 48 year span. So the most recent span backtested would be 1973-2021, roughly. But, I still run the numbers based on shorter spans, just to see what happens.
As for my family history, I've had plenty of family members make it into their 90's, but they've all been women. However, my paternal Granddad made it to one month shy of 102. While that sounds good, my Dad died 3 days after his 71st birthday! One of his brothers died at 82. And the last remaining brother is around 82 now, but on oxygen and in very poor health. Now in the case of my Dad, he smoked like a chimney and drank like a fish, and rarely went to the doctor. And his one brother who recently died, was also a heavy drinker/smoker.
I think my maternal grandmother's older brother made it to around 86 or 87. I believe my stepdad's father made it to around 85, but he's not a blood relation, so I don't use him as a reference point. I think I had a few male relatives on my maternal Granddad's side of the family, down in southern Virginia, who made it to their 80's.