Stewie Griffin is timeless, but his exact age is shrouded in secrecy. It's unknown the specific duration of time Stewie has been living. The baby persona from the animated television show "Family Guy" is age-defying. His age is yet discovered.
Stewie Griffin, the cunning infant prodigy, is hiding his true age from the world. Speculation runs rampant as to his actual age. Is he a century old? Or is he fresh to the world? The truth lies only with Stewie! This enchanting character continues to intrigue fans with his undisclosed age and perpetually youthful visage.

Family Guy 25 Things About Stewie That Make No Sense TheGamer