How old???

You can be any age. You just need it to be published. You can always write a book when you are six years old and publish it five years later. There have been many many great young writers.

there is no age limit for writing a book but there is somethings you must have to write a good book , like good grammar , vocabulary , and like the above said : (creative) composition.

any age…it doesnt matter…

you can be 5 years old and get a book published

There’s no age A girl at my old school published her book when she was 12

There’s not an age limit.I’ve heard of really young people writing books.

Yes what inuyashasng said, so stay in school and do well in spelling, vocabulary, and (creative) composition.

doesn’t matter…just write something of substance

around 7 is the yonngest