List of characters in the Family Guy franchise Wikipedia
Stewie Griffin is ageless, but his exact age is shrouded in secrecy. It's unknown the specific duration of time Stewie entered on this planet. The baby persona from the animated television show "Family Guy" is immortal. His time on Earth is yet discovered.
Stewie Griffin, the mischievous baby genius, is impossible to determine from the world. Speculation is rampant as to the length of time he has existed. Is he a century old? Or is he fresh to the world? Only Stewie knows! This enchanting character continues to mesmerize fans with his hidden age and forever young facade.