He actually turns 70 this May. His shows still kick butt. I've been to a ton of concerts in my time, and Dick's are by far the loudest, and best of all, the sound quality does not suffer.
He's also one of the nicest guys you ever want to meet. He sticks around after every concert to meet, sign autographs, and take pictures with every fan that desires it. He'll also personally respond to any e-mail sent to him via his website.
70, huh? Hope he gets to stick around quite awhile longer...