As long as your education is at an equivalent level to that of somebody that has completed 12th grade, then no, you don't. Some colleges have minimum age requirements, though...
He graduated from Eureka College in Eureka, Illinois.
She attended Spelman College and then Sarah Lawrence College where she graduated in 1965.
He attended Harvard University, and graduated in 1755.
Franklin Pierce graduated from Bowdoin College, class of 1824.
Obama graduated Harvard Law in 1991
Kurt Rambis, graduated from Santa Clara University
He graduated from Harvard Law School in 1991
Yes. He graduated from Miami University in Oxford, Ohio.
She graduated high school in 2000.
Harding graduated with a BS degree from Ohio Central College in Iberia, Ohio.
No she didn't attend college. Black women were unable to attend college in her time. She graduated high school in 1934 and worked as a housekeeper.
Jason Varitek graduated from Georgia Tech with a degree in management.