She was 9
Helen was 20 when she wrote her first book, The Story of My Life.
she was 90 when she wrote her lat book "The First Four Years"
she is an Australian author, who wrote and published her first book at 11 years old
26
he was 56 wrote his first book
Laura began writing the books when she was 65 years old.
Charles wrote his last book at the age of 58 years old and wrote his first book at the age of 24 years old.
Mary Shelley was 20 years old when she wrote her first book, "Frankenstein".
Isaac Asimov was 21 years old when he wrote his first book, "Marooned off Vesta."
enid blyton was 14 when she wrote her first book "childrens whisper"
John Boyne was 29 years old when he wrote his first book, "The Thief of Time," which was published in 2000.
Looking at some of his websites and info it s unknown when he wrote his first book he wrote story's at the age of 12 and at 19 wrote a book (around 19).