Here's what the book says in that part of the story...
Quote:
"I feel I need a holiday, a very long holiday, as I have told you before. Probably a permanent holiday: I don't expect I shall return. In fact, I don't mean to, and I have made all arrangements.
'I am old Gandalf. I don't look it, but I am beginning to feel it in my heart of hearts. Well-preserved indeed!' he snorted. 'Why, I feel all thin, sort of stretched, if you know what I mean: like butter that has been scraped over too much bread. That can't be right. I need a change, or something.'
|
So that's not where it came from. I'm remembering a bones line too, but it wasn't there, and it might not have been Bilbo.