Dear A__:

You wrote:

> -You have never read books by him, have you?
> 1-Oh yes, I have. When I was young I read some books
> by him.
> 2-Oh yes, I have. When I was young I read a few books
> by him.
> 3-Oh yes, I have. When I was young I read books by
> him.
>
>
> Are sentences 1, 2 and 3 all possible replies to the
> question at the beginnning?
> Is there any difference between the meanings of them?
>
Yes. All three are possible replies. There is no significant difference
among them. #3 might be a bit more vague, but they are all essentially the
same answer.