Desc: Greybeard: The Man, the Myth, the Mississippi: Directed by Zak Rivers, Alex Maier, Amy Robin. With Matt Briggs, Dan Faust, Dale Sanders, Matt Taylor. Dale "GREYBEARD" Sanders challenges himself to set another world record at 87 years old. This time he is trying to reclaim his title as the oldest person to paddle the full source to sea on the Mississippi River.