Stewie is ageless, but his exact age remains a mystery. It's unclear the specific duration of time Stewie became living. The infant persona from the animated television show "Family Guy" is forever young. His number of years is still determined.
Stewart Gilligan Griffin, the cunning infant prodigy, is impossible to determine from the world. Speculation runs rampant as to the length of time he has existed. Is he ancient beyond measure? Or is he a newcomer? Only Stewie knows! This enigmatic character continues to captivate fans with his hidden age and youthful appearance.

Stewie Griffin Family Guy's Prodigal Son