Stewart Gilligan Griffin is ageless, but his specific age is shrouded in secrecy. It's unclear how old Stewie has been living. The toddler persona from the animated television show "Family Guy" is age-defying. His number
of years is yet revealed.
Stewart Gilligan Griffin, the clever little troublemaker, is impossible to determine from the world. Speculation runs rampant as to how many years he has been alive. Is he ancient beyond measure? Or is he a newcomer? The truth lies only with Stewie! This enchanting character continues to intrigue fans with his unrevealed age and perpetually youthful visage.
Stewie Griffin Wikipedia