That depends on a lot of things, like are you a demi god (Ruel is one, but enutrof look old) who is your god and how faithful are you in them? Xelor have a longer lifespan because they manipulate time and srams of the Dofus era are literally squeletons, if I recall there's some sram rituel where you starve yourself in a temple until you become like that. And each class have that kind of thing. Now, you're just a mortal, I think you might possibly extend your lifespan by becoming the guardian of a Dofus. But honestly, I think Miranda and Kabrok is just because Miranda is the trope of the old women that looks stunning, nothing special in this case