List of characters in the Family Guy franchise Wikipedia
Stewie is forever youthful, but his exact age is shrouded in secrecy. It's unclear the specific duration of time Stewie became living. The toddler character from the animated television show "Family Guy" is forever young. His time on Earth is yet discovered.
Stewie, the mischievous baby genius, is hiding his true age from the world. Speculation is rampant as to his actual age. Is he over a hundred years old? Or is he fresh to the world? Only Stewie knows! This mysterious character continues to intrigue fans with his undisclosed age and youthful appearance.