Final answer:
Peter Pan, created by J.M. Barrie, turned 100 years old in 2004, celebrating a century since its initial introduction as a play in 1904.
Step-by-step explanation:
The story of Peter Pan was created by J.M. Barrie, with the earliest version, a play titled 'Peter Pan, or The Boy Who Wouldn't Grow Up', debuting in London in 1904. Given that, by the year 2004, exactly 100 years had passed since the story was first introduced to the public. This centennial marks a significant milestone in the history and lasting appeal of this classic work of children's literature.