What age group will this certification qualify me to work with?

This certification qualifies individuals as parent educators of families with children ages birth to one year. That does not mean an Instructor cannot work with a family who has a child a little older - in fact, the course includes a section on The Growing Child. It is inevitable that active Instructors will encounter families with older children - that's okay, adaptations are easy. This is just to clarify the parameters of your specialized certification.