Children's Dental Health Month Tip #23: There is a wide range of "normal" when it comes to tooth loss! Don't worry.

While some parents worry their baby isn't getting teeth soon enough, others worry their child isn't losing them as quickly as he should. Typically, children begin losing their baby teeth by age 6 or 7, although again, there is a wide range of what's typical. Some children lose their first tooth by age 4.

Children generally lose all their baby teeth by age 13. If your child hasn't lost all her baby teeth by this age, consult your pediatrician. (Adult molars may take until the early 20s to fully erupt.)
Most children lose their center teeth first and there should be 32 teeth when all the permanent adult teeth erupt.


http://www.ehow.com/about_5345124_baby-teeth-late.html