Before you think this is a political piece, it's not. No need to prepare for a discussion or debate -- there've been enough of them already. This is about breaking barriers. Not all that many years ago, people who reached 60 or retirement were considered finished. Done. Few worked and many simply faded away into the lull of old age. Their usefulness was over. Years of experience gone. Hardly the truth today. Hillary is 68, Bernie 74, and Donald 69, and each will turn on