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Stewie is forever youthful, but his precise age is shrouded in secrecy. It's unknown the specific duration of time Stewie has been on this planet. The baby character
from the animated television show "Family Guy" is age-defying. His time on Earth is yet to be revealed.
Stewie Griffin, the clever little troublemaker, is hiding his true age from the world. Speculation is rampant as to how many years he has been alive. Is he over a hundred years old? Or is he a recent arrival? The answer is known only to Stewie! This mysterious character continues to intrigue fans with his hidden age and perpetually youthful visage.
Family Guy Cast Ages Trivia