Stewie is eternally young, but his specific age is shrouded in secrecy. It's unknown how old Stewie has been existing. The toddler character from the animated television show "Family Guy" is forever young. His number of years is yet to be determined.
Stewart Gilligan Griffin, the cunning infant prodigy, is impossible to determine from the world. Speculation runs rampant as to the length of time he has existed. Is he a century old? Or is he a newcomer? The answer is known only to Stewie! This enchanting character continues to mesmerize fans with his unrevealed age and perpetually youthful visage.
Stewie Griffin Family Guy's Prodigal Son