He looked to be about in his 40's or maybe people seemed older back then. Guys like that really took a beating to entertain people. It's great that at the very least there is a kinescope of his act.

from wiki

Laurens (Larry) V. Griswold (September 17, 1905 - August 24, 1996), known as "The Diving Fool", was an American gymnast & entertainer who was involved in the early development of the trampoline.

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In the 1950s and 1960s, he took his physical clowning & acrobatic act all across the United States becoming one of the top draws in show business. He also performed on television variety shows, including the Frank Sinatra Show, The Ed Sullivan Show, Hollywood Palace and the Jackie Gleason Show. He toured internationally performing lavish shows in the United Kingdom, France and Japan before settling down for several years as a regular performer in the Folies Bergère.

he hurt himself in the 70s, he lived to 90 !

Even back then Griswald liked to kid around.