Characters in CK3 live way too long

[Vaniljkaka]

Sure, but like someone else already pointed out, none of us want to watch kids die every other year (or maybe I should just speak for myself) I don't want to watch kids die every game year.

So rather than 50% of the kids dying, they reduced the fertility rates. Which is why most nobles have 3-4 kids and not 12-14.

It's also because generating a large amount of characters only for them to die in infancy would be an unnecessary drain on the resources of the game engine, so it's partly a pragmatic design choice.