George Willard is probably about 19 years old based on character analysis of the protagonist.
George is a young man, though not a child, and he works as a reporter and starts at age 18. Over the course of the text, George develops relationships with many of the other characters because he is featured in many of the other characters' stories. He has many of the characteristics of a man in early youth...he seeks a love relationship and matures in his thinking as the stories progress.
Considering how the author is expressing Bindi's joy of sharing what she has, you can tell the author is glad Bindi is spreading a positive message. Hope this helps!! :)