Behind-the-scenes photos of TV sets might be pretty common ... of a 1999 episode of Buffy the Vampire Slayer: 15.Here's Willie Nelson recording music for a 1997 episode of King of the Hill ...

(Photo by Rick Kern/WireImage for Shock Ink) Most people in their 90s aren’t working any longer. Very few are still going as hard as Willie Nelson is, especially in the music industry.