elves and death

[The Saucepan Man]

I am sorry but only the half elves could choose to be mortal or not.

To bring further precision to the debate, only a select few Half-Elves were given the choice between mortality and immortality. From memory, they were Luthien, Elrond, Elros, Arwen, Elrohir and Elladan. In each case, Iluvatar, through the Valar, allowed them the choice in consequence of the extraordinary acts of valour that they or their predecessors committed. Of those mentioned, only Elrond (and possibly his sons, we don't know) chose immortality.

The choice was not automatic upon them having Elvish blood. The ancestors of the line of Dol Amroth were not given the choice. Neither were the offspring of those who chose mortality (the children of Elros and of Aragorn and Arwen, for example).