Chewbacca was committed to a life of adventure when he joined Han Solo, and Star Wars has finally hinted at his first adventure before meeting his closest friend. Chewbacca was 200 years old for his first appearance in the original Star Wars film, making him middle-aged with an average lifespan of 400 years. This means Chewbacca could have had countless adventures over a long life before meeting Han in Solo: A Star Wars Story. However, a new Star Wars reference book suggests that Chewbacca had his first real adventure only a few decades before swearing a life debt to Han.
https://screenrant.com/star-wars-chewbacca-adventures-before-han-solo/