I appreciate the many who took time to wish me a happy birthday this Sunday as I reached middle age, celebrating my 52nd birthday. Happy birthday to me.As I sat around eating my tower of onion rings and boneless hotwings at Hooters on Sunday afternoon during my birthday meal, I took a bit of inventory of my mortality especially since I was eating greasy, yet tasty, onion rings.Why exactly is the 50s considered middle age anyway? Are most of us so deluded or cocky to believe we are going to live to be 100?