Who was the youngest person on the muppets?

The youngest performer associated with the Muppets was Frank Oz, who began working with Jim Henson's creations as a teenager in the 1960s. He became well-known for his characters like Fozzie Bear and Miss Piggy. However, if you are referring to the youngest character, that would likely be Baby Kermit, who was introduced in various Muppet productions.