Dick Van Dyke Gets It.

Dance, Sing, Just 'Keep Moving,' Dick Van Dyke Tells Seniors : NPR: "Keep moving is the main thing. I think I reiterate three or four times in the book, "do not start going down the stairs sideways." It feels good on your knees but it throws the hips out and the back starts to go out, the next thing you know, you've fallen down and broken your hip. So even if it hurts a little, go down the stairs front-ways. It's more in my nature to be optimistic, I think. I'm one of those people who gets up on the right side of the bed in the morning. I get up and have a cup of coffee and go to the gym before I talk myself out of it because I will as anybody will...

On the hardest part of getting old 

Giving up the things that you enjoy doing. I can't handle the tennis court anymore. I can still run and dance and sing. You know, I made a habit of asking other people in their old age: of all the things you enjoyed doing when you were younger that you can't anymore, what do you miss? And some people mention golf or tennis. One woman said "I miss having lunch with the girls." But the people who said I wish I had made smarter business decisions, I think they're missing the point. The point is to enjoy. You have to pick what you enjoy doing, what fulfills you, what interests you. And I realize that's not possible for a lot of people. As Thoreau said, a lot of people are living lives of quiet desperation. But almost anyone can find that one immersing hobby or pastime that they love to do ... and someone."