1. The Harry Potter Series by JK Rowling...I know the first books in this series were published over ten years ago but the last ones qualify. I hope that kids and adults alike still find these books magical.
2. Looking for Alaska by John Green (2005)...This was John's first novel and it is still one of my favorite YA books. Will young adults still be able to relate to it, as they do Catcher in the Rye, in 30 years? I hope so.
3. The Help by Kathryn Stockett (2009)...historical fiction as good as this one should continue to be popular in years to come.
4. The Absolutely True Diary of a Part-time Indian by Sherman Alexie (2007)...It is pretty hard to imagine most YA fiction standing the test of time. This one deserves to be one that does.
5. The Hunger Games series by Suzanne Collins (2008)...Remember being blown away by the first book in this series when you read it? Let's hope that is continues to delight generations to come.
6. The Book Thief by Markus Zusak (2007)... I know that the horrors of the Holocaust and WWII will still be with us in 30 years. This book is so well-written, it deserves to be a "classic."
I am having a harder time than I thought creating this list. Let me sleep on it and I'll add to the list.