@PipMenaceI have my elders immortal via the occults, usually magic (only immunity to aging though, full immortality can be done via werewolves too, vampires are the best option though, can't die in most conventional ways* with an easy out for when you want rid of them) and I play with aging on, very risky, I know.
My elder has been around for around 18 generations or more, I did mess up the family tree a bit, more than once, too.
okay it might just be a family square thinking about it. Maybe a spiral, like a lineage spiral, that's a cool name actually.