The phrase "kids ages" refers to the different ages of children. It is often used when talking about a group of children who are of various ages. Full definition
This recommended for kids aging from 3 - 6. (babyishcare.com)
This will help them make friends with other kids their age who are also expecting a sibling, and empower them to be in a position to help you. (health-and-parenting.com)
Would your child enjoy choosing from a list of books that thousands of kids their age voted as their favorites?. (growingwithyourchild.com)