Valet av dödlighet är permanent.
När du väl väljer Mäns gåva är du dödlig och alla dina efterkommande kommer att vara dödliga. Endast om du är odödlig kan dina efterkommare välja att vara dödlig eller odödlig.
I männens ord:
"The view is that the Half-elven have a power of (irrevocable) choice, which may be delayed but not permanently, which kin's fate they will share. Elros chose to be a King and 'longaevus' but mortal, so all his descendants are mortal, and of a specially noble race, but with dwindling longevity: so Aragorn (who, however, has a greater life-span than his contemporaries, double, though not the original Númenórean treble, that of Men). Elrond chose to be among the Elves. His children - with a renewed Elvish strain, since their mother was Celebrían dtr. of Galadriel - have to make their choices."
-- Tolkien, Letter No. 153