Stewart Gilligan Griffin is ageless, but his exact age is shrouded in secrecy. It's unknown the exact number of years Stewie entered on this planet. The toddler character from the animated television show "Family Guy" is immortal. His number of years is still determined.
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 ancient beyond measure? Or is he a recent arrival? The truth lies only with Stewie! This enigmatic character continues to intrigue fans with his undisclosed age and forever young facade.
Stewie Griffin Wikipedia