List of characters in the Family Guy franchise Wikipedia
Stewie Griffin is ageless, but his exact age remains a mystery. It's unknown the specific duration of time Stewie has been existing. The baby character from the animated television show "Family Guy" is age-defying. His time on Earth is yet revealed.
Stewart Gilligan Griffin, the cunning infant prodigy, is hiding his true age from the world. Speculation is rampant as to his actual age. Is he ancient beyond measure? Or is he a recent arrival? The answer is known only to Stewie! This enchanting character continues to captivate fans with his hidden age and perpetually youthful visage.