I think this book can be read at younger ages, by advanced readers 9-10 years old, but I think on an emotional level it is better to read it later. I read it at 14 and it resonated on a deep intellectual emotional and psychological level. I do not think any other book has shaped my views or my attitudes so strongly growing up. There are few books that can surpass this one in terms of writing style or language complexity, so I would recommend it to everyone. Jane Eyre the character is one of the most interesting women in all of fiction because she breaks every predictable mold of what a title heroine should be. The plot and the moral subtleties make this novel an absolutely phenomenal read.
Jane Eyre is undoubtedly a classic, but a mature one at that. Though there isn't any noticeably questionable content, it certainly isn't written for children--the book's vocabulary and sentence structures are dated and complex, and should be confusing for children that aren't avid readers. However, I read this book when I was twelve and I loved it.