What central character is introduced in Chapter 1? What is he doing when the narrative begins?

In the very brief Chapter 1, the author sets in motion the entire plot for The 100-Year-Old Man Who Climbed Out the Window and Disappeared. Readers are introduced to Allan Karlsson, the century-old retiree who escapes via the window from his old folks' home and sets out on a (what he presumes to be) final adventure in life.