[binarycrusader]

Some states such as Virginia (although with an exception if the person has a high school diploma or equivalent):

https://www.vccs.edu/application-information/

To qualify for general admission to a college, you must have a high school diploma, its equivalent, or be 18 years of age or older.

Unclear whether that is statewide or just a requirement of this state institution. I suspect many of the ones that do have this age requirement also have the diploma exception.

[Jtsummers]

By what you quoted, VA does not require you to be an adult to attend college, if you graduate high school early (or somehow satisfy the diploma requirement early) you can attend college there (assuming you get admitted and meet whatever other requirements they have like SAT scores and such). That's not an example of a state barring minors from attending college.