GED is a General Education Diploma, also sometimes called a high school equivalency diploma. If you graduated high school, you have a high school diploma. If you did not graduate high school, but took a GED exam and passed, you received a GED diploma. read more
In the United States, you can go to high school until you are 21 years old, however, most people graduate at the age of 17 or 18. Graduation is based more on having completed the courses required for graduation rather than your age. read more