Question

WHO WAS THE YOUNGEST AUTHOR WHOSE BOOK WAS PUBLISHED AND WHAT BOOK DID HE WRITE?

Answer 1

Dennis Vollmer wrote and illustrated Joshua Disobeys at the age of 6 in USA and it  was published in 1988. 

Answer 2

Dennis Vollmer was the first one to illustrate Joshua Disobeys when he was of 6 in United States of America and it  was published in 1988.