As a literature enthusiast who spends hours diving into the history of iconic books, I can confidently say that the '100-Year Book' isn't a widely recognized title in mainstream literary circles. However, if you're referring to 'The Hundred-Year-Old Man Who Climbed Out the Window and Disappeared' by Jonas Jonasson, that was originally published in 2009. This Swedish novel became a global sensation for its dark humor and eccentric protagonist, Allan Karlsson, who escapes his nursing home on his 100th birthday.
If you meant another book with a similar name, it might be a lesser-known work or a regional publication. For instance, 'One Hundred Years of Solitude' by Gabriel García Márquez, a masterpiece of magical realism, was published in 1967. The ambiguity in the title '100-Year Book' makes it tricky, but exploring these alternatives could lead you to the story you’re seeking. Always fascinating how a slight misremembered title opens doors to other literary treasures!