Enrollment Child Advocates of Blair County Head Start & Pre-K Counts Year-round Enrollment Both the Blair County Head Start and CABC Pre-K Counts programs enroll children year round. Please choose which program you would like to pre-enroll your child in. Head StartBlair County Head Start serves income eligible children three to five years of age. * Note: Head Start Pre-Enrollment App is on an external website. Pre-K CountsPre-K Counts is a comprehensive early education program funded by the PA Department of Education.