Okay, you'll love this. A few years ago, two filmmakers — Saratoga Ballantine and Dea Lawrence — made a documentary called Troupers, profiling a group of actors over the age of 80. They were Carl Ballantine, Kaye Ballard, Ivy Bethune, Betty Garrett, Pat Carroll, Harold Gould, Marvin Kaplan, Justine Johnston, Jane Kean, Bruce Kirby, Allan Rich, and Connie Sawyer. A few of them have left us since then but some of them are still working.
I could embed this but the way they have the video configured, you'll get a better feed if you go to this page and watch it there. It runs about 85 minutes and if you start viewing, you may get hooked and have to watch the whole thing. So check the time before you go peek.