Galadriel's death

[Beleg]

I've started to read again the LoTR, and found something in the prologue that puzzles me.

From "Note on the Shire records" - extract from the French version (sorry again):

"Là, bien qu'Elrond fût mort, ses fils demeurèrent longtemps, ainsi que certains des hauts Elfes. On dit que Celeborn alla y résider après la mort de Galadriel..."

It is said that Merry went a lot of times to Rivendell to collect information for his book. In this place, he was with Elrond's sons after his death + Celeborn himself who used to come there after Galadriel's death.

I haven't noticed that before. But are Elrond and Galadriel not supposed to leave Middle-Earth and not to die?

I'm reading the Grey Havens and the appendice. The chronology states:

3021 - 29th september: Frodo and Bilbo, from the Grey Haven leave Middle-earth by the sea with the three Guardians. End of the 3rd Age.

Is there something I missed. In that case, shame on me, I thought to know the book enough not to ask such a question.
Or is it an interpretation: when Cirdan, Gandalf, Galadriel and the hobbits leave Middle-Earth, this departure is considered as a "terrestrial" (arghh) death?

Or is it again, a bloo** mistake from Francis Ledoux in his translation of the Lord of the Rings... For that you cannot answer.