请问如何翻译这句话:我读过他的小说,但没料到他如此年轻.

我读过他的小说,
I've read his novel before,
但没料到他如此年轻
but never expect that he is so young.

I have read his novels, I never expect he would be in such young age.

i have resd his novel , but never expected he is so young

I've read his novels, but never thought he is so young.

I've read his novels, but never expected he would be such young.

I have already reading his novel,but i dont think he was so young.