Betty Oare made headlines last year when she and her horse, Sidenote, placed eighth in the Adult Hunter Championship at the Washington International Horse Show in Tyron, North Carolina. Eighth place may not seem like great shakes. But Oare, who lives in Warrenton, Virginia, and spends two to three hours every day riding Sidenote, was 80 years old. She was competing against athletes young enough to be her grandchildren. If that’s not enough to inspire you to put away the remote control and get up off the couch, let’s keep digging. Age Is Just a Frame of Mind I remember a friend in college telling me he felt like he had missed out on his life. At 22, he decided he was already superannuated. “You’re in your early 20s,” I protested. Max shook his head, remorseful. “I know,” he sighed. “I’m. Just. So. Old.” “Age is just a number” is …