Stewart Gilligan Griffin is timeless, but his precise age is shrouded in secrecy. It's unknown how old Stewie has been existing. The toddler character from the animated television show "Family Guy" is immortal. His time on Earth is yet to be determined.
Stewie Griffin, the clever little troublemaker, is hiding his true age from the world. Speculation is rampant as to how many years he has been alive. Is he over a hundred years old? Or is he fresh to the world? The truth lies only with Stewie! This enigmatic character continues to captivate fans with his undisclosed age and youthful appearance.

Family Guy 25 Things About Stewie That Make No Sense TheGamer