Suspected genetic patterns in family history

Fascinating, but also, oh, ouch.

My gg Grandma and Grandpa Pierce were at the other end of this spectrum. They had 22 kids, and 20 lived to ripe old ages.

Wow, that's an intriguing find. It'd be handy in learning more about the family medical history.

In my dad's family, the pattern I've noticed is that every single generation has at least one centenarian, and the majority have made it to at least 80.

In addition to that, there may also be a twin gene from one of my ancestors on my mom's side.  My great-grandmother had two younger siblings who were twins, and their ancestry traced back to a woman who had twins in the 1730s in Louisiana.  We're actually descended from both of those twins, and while there weren't any others in our direct line that I can recall, instances of twins popped up fairly frequently among descendants of that family.  I've wondered if it was just the higher number of children people had back then that increased the odds or if there really was a genetic predisposition being passed down.