"Old age isn't a battle, old age is a massacre."
Philip Roth's "Everyman" is a book about life, but really about death. It's about a guy who is consumed with the idea of death and how it all ends. It was short and the writing was VERY raw, but I really enjoyed it.
Another line that stuck with me: "When you're young, it's the outside that matters. When you're old, it's the inside that matters."