Reading choices

I always struggle to find good books/series for my children to read. How do you make sure the books your children read are age appropriate?

I came across this good article recommending books for 4th/ 5th graders and most of these books are approved by kids as well.

http://www.readbrightly.com/12-kid-approved-books-advanced-fourth-fifth-grade-readers/

When you are on this website, checkout the other articles on their website as well.