In 2004, a Chicagoan’s idea for a masters sports magazine caught my attention and fluttered my heart. It had me at its title — GeezerJock. Despite the cheeky name, editor Sean Callahan and partners were serious, and I joined as a contributing track writer. In 2005, it even named an obscure 54-year-old sprinter named Bill Collins as its inaugural Michelob ULTRA GeezerJock of the Year. But in 2008, after months of editorial excellence but poor circulation (and changing its name to Masters Athlete), the book I called Sports Illustrated for age-groupers folded amid the Big Recession. (The same publication pandemic…