Family Guy Cast Ages Trivia Stewart Gilligan Griffin is eternally young, but his precise age remains a mystery. It's unclear how old Stewie entered on this planet. The toddler persona from the animated television show "Family Guy" is immortal. His time on Earth is still discovered.
Stewie, the clever little troublemaker, is keeping his age a secret from the world. Speculation runs rampant as to how many years he has been alive. Is he ancient beyond measure? Or is he fresh to the world? The answer is known only to Stewie! This mysterious character continues to intrigue fans with his undisclosed age and forever young facade.