I get the feeling this might transform into long life (to your eternity / Frieren) situation since he is in a world with long living beings and a narration that supports him living an extremely long time. I can't think of an exact reason other wise for why he would need the eternal youth which usually includes immortality. I think it will be similar but a lot slower if that makes sense like he will be known by kingdoms for living for many generations and that he has a family of knights that work for him for generations or something.
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