The Disciples of Aldur have lived for multiple thousand years. Do they not die of age?
Why is it that the Rivan Kings died when their time came, but not their ancestors? What does it mean for Belgarion as he is both a sorcerer and a Rivan King?
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None of the kings of Riva (or united Aloria) before Belgarion were sorcerers. Riva Iron Grip and Beldaran were, neither one of them, sorcerers, despite Beldaran being descended from two (Belgarath and Poledra). The Prophecy didn't need them to be, so they weren't.
Eddings never really explores the timeline past the advent of Eriond and the birth of Polgara's twins. We have one hint, in the form of a citation from, The Lives of Belgarion the Great, which title suggests that Belgarion went on to do other things. We also know that his son is marked as a Keeper of the Orb, which would allow Belgarion and Ce'Nedra to eventually abdicate the throne in Prince Geran's stead. Whether Geran, Princess Beldaran, or any of the other daughters Belgarion and Ce'Nedra seem fated to have, turn out to be sorcerers was left unanswered.