How is the increasing average age of the world’s population affecting society and ultimately altering our lives? We’ll spend this hour with journalist and writer Ted Fishman, whose new book is “Shock of Gray: The Aging of the World’s Population and How it Pits Young Against Old, Child Against Parent, Worker Against Boss, Company Against Rival, and Nation Against Nation” (Scribner, 2010). Fishman will address the World Affairs Council of Dallas Fort Worth on Tuesday.