hillary at 72 is not a pleasant thought. I can't imagine her aging well, either philosophically or as a decision maker. I say that as an age-compatible woman observing signs in myself and my friends about how the aging process is going.
Keep in mind that when she runs it will be 16 years after hubby left the presidency. Younger voters will think of him as ancient history and her as hillary "what difference does it make" Clinton.
Recent voting patterns repudiate this statement. Young people are technologically savy but less able to understand the Constitution than their liberal grandparents.