I was in Mexico when the sixth book was released, and being a huge Harry Potter fan, was extremely sad. I did manage to get it, though.
Anyway, this is one of my favorite books of the series!!!! I've been predicting Ron/Hermione and Harry/Ginny for ages and I'm glad to see that it's finally happened.
I think that this book is fine for practically all ages. A character dies in the end, and many people are upset about it, but it's not an extremely violent death. Younger kids may not understand the immortality and death parts of this.
The kissing is ok too. It's not graphic at all and although it's implied that it happens a lot, it's only mentioned a few times.