There is a stage you reach, Deagle thinks, a time somewhere in early middle age, when your past ceases to be about yourself. Your connection to your former life is like a dream or delirium, and that person who you once were is merely a fond acquaintance, or a beloved character from a storybook. This is how memory becomes nostalgia. They are two very different things - the same way that a person is different from a photograph of a person.
There is a fragrance in the air, a certain passage of a song, an old photograph falling out from the pages of a book, the sound of somebody's voice in the hall that makes your heart leap and fills your eyes with tears. Who can say when or how it will be that something easters up out of the dimness to remind us of a time before we were born and after we will die?