Did Elladan and Elohir Die or go to Valinor

[Atariel]

I don't know where I picked this up from, but I read somewhere that Elrond and Arwen had a bitter farewell, and, as you know, after this Elrond returned to Rivendell. He left with the other ringbearers in the white ship, in the belief that Elladan and Elrohir would catch up with him later on. "But then he was torn from his sons at the last". (That was the only part I remembered from the qoute, but hopefully you'll get the gist of it.)