“Wouldn’t miss it for the world.” “Let me check my calendar.” “Meh.” “You mean I still haven’t outlived all those #@%& low-lifes?” As you doubtless know, those are the four main responses when a class reunion invitation arrives. (Close runner-up: “If I remember my eighth-grade civics teacher correctly, this first-class stamp cost almost as much as FDR’s New Deal.”) Me? I had a wonderful time …