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If Tuor was allowed to become immortal and live with the elves
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IF. It's also highly likely that was just a sentimental legend.
Had he reached Valinor- including by drowning and transport to Mandos- and been permitted to join the Elves of of the Blessed Realm- his case would have been raised as precedent when his son arrived. But instead Mandos, on the latter occasion, flatly declares that no Man may tread the Undying Lands and live.
Dior didn't live long enough for us to point to any unusual longevity; born 470 died 506.