It's interesting to compare this some research which says that children of older fathers and grandfathers live longer. If I understand this article correctly, it's saying that if the paternal grandfather was also older when becoming a father, that's even better.
Huh, anecdotal as heck, but my great-great grandfather (the only one I know about) had the line that led to me in his 50's after his first wife succumbed to Spanish Flu. I buried his youngest daughter at the foot of his grave 154 years after he was born; she lived to be 94 and so did my grandfather.
Thinking about it even more, the women on that side of my family also had no problem having kids into their 40's.
https://www.bbc.com/news/health-18392873