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Stewie Griffin is forever youthful, but his exact age remains a mystery. It's unclear how old Stewie has been existing. The baby persona from the animated television show "Family Guy" is age-defying. His number of years is yet to be discovered.
Stewie Griffin, the clever little troublemaker, 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 mysterious character continues to intrigue fans with his undisclosed age and forever young facade.
Chris Griffin Wikipedia