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In the absence of any statements to the contrary, I think it is safe to assume that demigods have normal human lifespans for people of their rank and profession (i.e. Bronze Age soldiers and royalty). I can't recall any myths that mention, for example, a demigod dramatically outliving their non-demigod spouses, the way that Arwen is foretold to outlive ...
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Definitions
Presumably by "demigods" you are referring to the relatively modern term as taken to denote a character from Greco-Roman mythology who is the offspring of a deity and of a human being.
The Ancient Greek hēmítheos and the Latin semideus, from which we get the English "demigod," does literally mean "half-god," but this ...
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