I always see rudy as something else, sort of mediator between adventurer and lander, he dont have any bad will toward lander and adventurer since he is basically both of it.
I dont think it ever shown in the anime, but i take it since rudy is considered an adventurer, does it mean he cant die like other adventurer? If yes then by lander standard he just achieve "immortality"
By the way do lander (and maybe the adventurer too) age? Iam sure the real body of adventurer outside the game is aging but inside elder tale?