Eligible family members do not need to be Australian citizens to qualify for E-3 dependent status. Unmarried children under 21 years of age and spouses of E-3 employees are eligible for E-3 status. A child can no longer stay in the U.S. as an E-3 dependent after turning 21. In order to remain in the U.S., the child must change to a different nonimmigrant visa status (e.g. F-1 student, B-2 visitor).