How old??

how old do you have to be to wright a book?

doesn't matter...just write something of substance

u can be any age too write a book. writing a good book takes creativity and imagination. if you want to write a book you should do it but dont give up half way into it and finish it and maybe you can get it published for the whole world to read

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

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...

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.

you can be 5 years old and get a book published

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.

around 7 is the yonngest