This word developed from the Latin word “juvenilis,” which translates to “juvenile.” It means any work — written or artistic — produced in one’s youth. If you practiced a hobby as a juvenile, you might have a box of juvenilia stashed away somewhere. Wolfgang Amadeus Mozart produced amazing juvenilia during his younger years. He began composing music at age 5; by the time he was 12 years old, he had composed whole symphonies and performed in front of royalty.