[Joy]

As for Elves, I don't have a clue, but with the case of Aragorn, I agree with Kuruharan. It was a special grace that enabled them to know when their life was at its end and choose to pass on, to yeild their spirit back to Ilùvatar, who created them. I have seen cases of several people who in their 80's or 90's have decided that they are ready to die. They tell their family's and have their will read and executed, then they go to their beds and die within the hour. They, by their own will give their spirit permission to leave.

This is not suicide in the common sense of the word. The word suicide come from the Latin sui meaning self and another word, which I have forgotten meaning murder. They do not kill themselves in a violent matter, like a murder, but peacefully decide to let their spirit go.