The footage of Charlie begins around the :36 mark & lasts about 22 seconds. A large group of Canadian Rotarians were also at the park that day and Charlie is seen in the clip wearing one of their hats.
A caption in the video says Charlie is "Age 44." The date of this video is given as "Spring 1935," so Charlie would have been 46, or close to it. His hair also appears to be dyed for the filming of Modern Times.