Well, he was born in 1951, so he was about twenty. Still it's totally amazing, and I love that old footage.
This one was in Paris, probably from the same European tour. He takes a solo at 7:20:
http://www.youtube.com/watch?v=j0fn-xyaGHE
And please check out his older brother Catfish (RIP!) stepping up for his solo at 4:21. That family had rhythm.