Children Programs For program calendar and registration click here For all programs, children must be the appropriate age at the START of the program. Child/Parent must be a Yorktown or Cortlandt resident and have a valid Hart Library card. PreSchool Programs Programs for children Birth to age 5 School Aged Programs Programs for children kindergarten - 5th grade. Drop in Programs Special drop-in programs. No Registration Required! Ticketed Programs Special drop-in programs