What are the most popular chapter book series for children ages 6-12? Are there any classics that have stood the test of time? Are there any newer series that have become popular?I'm curious to know what chapter book series have been the most popular among kids ages 6-12. I'm looking for both classic series that have been around for a while, as well as newer series that have become popular. I'm interested to see what books have been the most successful and why.