Final answer:
Mark Twain got a job as an apprentice at a local print shop when he was 13 years old.
Step-by-step explanation:
When Mark Twain was 13 years old, he got a job as an apprentice in a local print shop. He originally trained as a printer before pursuing a career as a writer, journalist, and humorist. Twain's experiences working in the print shop likely influenced his later work as an author.