By Kelly Hockenberry, Columnist, The Times When was the last time you changed your look? I’m not talking about experimenting with a different color lipstick…I mean, REALLY switched things up. I bet the majority of you are scratching your head. A long time, huh? About 10 years ago, it was forced upon me. I went to a new salon for a trim on my shoulder length hair and emerged an hour later...