Stewart Gilligan Griffin is timeless, but his exact age remains a mystery. It's unclear the exact number of years Stewie entered living. The infant character from the animated television show "Family Guy" is immortal. His number of years is yet to be determined.
Stewie, the mischievous baby genius, is keeping his age a secret from the world. Speculation is rampant as to his actual age. Is he ancient beyond measure? Or is he a recent arrival? The truth lies only with Stewie! This enchanting character continues to mesmerize fans with his unrevealed age and youthful appearance.
List of characters in the Family Guy franchise Wikipedia