Stewie Griffin is timeless, but his specific age is shrouded in secrecy. It's unknown the exact number of years Stewie has been living. The baby character from the animated television show "Family Guy" is immortal. His time on Earth is yet revealed.
Stewie, the cunning infant prodigy, is keeping his age a secret from the world. Speculation runs rampant as to his actual age. Is he ancient beyond measure? Or is he a newcomer? The truth lies only with Stewie! This mysterious character continues to mesmerize fans with his undisclosed age and youthful appearance.

Stewie Griffin Family Guy's Prodigal Son