Prince Imrahil and his mortality

[Belegorn]

Originally Posted by The Mouth of Sauron

At what stage was Elven immortality removed from Imrahil's line? Did it depend on the percentage of elven blood, so that when it was diluted to a certain level death ensued?

I doubt his line ever was immortal. The Dúnedain did not appreciate their Doom and feared death. It was more noticeable in the King's house on Númenor, but it touched even the band of the Faithful. It continued after the Fall. I would think, that based on these inclinations (regretting Elros' choice), that a Dúnadan like Galador would choose immortality if he were actually given the choice.

Originally Posted by The Window on the West

Death was ever present, because the Númenóreans still, as they had in their old kingdom, and so lost it, hungered after endless life unchanging.