I hold the perspective that retirement can be the chance to reward our fellow human beings with some time to play, to learn, to enjoy life without the massive problems that holding a job entails. If the economy can sustain retirement at 65, perhaps that is best for most people. 
As it is, our American economy probably doesn't need millions of older workers. They cannot compete with robots, or people in China working for peanuts.
Ask today's 65-68 year olds if they think working longer is a good idea. I doubt they would vote for that.
Hugh Massengill, Eugene