high school graduation age

US’s High School education system finishes around the age of 17 at “Grade 12”. Their Universities are usually a 4 year course, but with more flexibility because you decide each class yourself. However, you are also required to take General Classes mostly within the first couple years, but they are no different to Senior classes in High school.
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This information was produced by the staff of the Belin-Blank International Center for Gifted Education and Talent Development (B-BC) at the University of Iowa (belinblank.org). The resources and information listed here are for informational purposes; there is no direct or implied endorsement by the B-BC. Services provided by the B-BC include programs for academically talented K-12 and college students, professional development for teachers, the Assessment and Counseling Clinic, the Acceleration Institute (accelerationinstitute.org), and graduate programs and research in gifted education.

To obtain a Mature Student High School Diploma under the Grade 9 to Grade 12 (Senior 1 to Senior 4) Mature Student Graduation Requirements (2003), a student

must be 19 years of age or over at the time of enrolment in school division/district or ALC programming directed at completing the Mature Student Graduation Requirements, or reach the age of 19 before completion of the course(s) in which he or she is enrolled
must have been out of school six months or more, and out of school long enough for the class, of which he or she was last a member, to have graduated from Senior Years; and
has not obtained a high school diploma.

References:

http://www.accelerationinstitute.org/Resources/Policy/By_State/Show_Policy.aspx?StateID=37
http://www.accelerationinstitute.org/Resources/Policy/By_State/Show_Policy.aspx?StateID=37
http://www.edu.gov.mb.ca/k12/policy/mat_student.html
http://www.educationworks.com/

high school graduation age