Step1
If you are in, or are the parent of a child in, junior high or high school it is not too early to start thinking about a college education.
You may take Advanced placement classes at your high school if possible. you might also try taking CLEP and other types of for-credit tests, just remember to study for them first.
I will also show how getting into your local community college can also possible.
Many colleges also award small amounts of credit for certifications and experiences (not all advertise though, so ask), so if you have (for example) a Red Cross basic child care and infant CPR certification it may be valuable.
As a base statement I will also say that college is expensive so get your credits as cheaply as possible and write LOTS of applications for scholarships, there are scholarships for an astounding variety of purposes, degrees, ages, races, etc. You don't have to wait until you apply to college to start applying - if you research scholarships in advance you can potentially target essay drafts to their requirements a year ahead of time. Be aware of deadlines in the application processes. There are much better advisers on the subject of Scholarships out there than I, just look for them.
Step2
Taking Advanced Placement (AP) classes: If they are available in your school or school district and if you are eligible you may take AP classes to earn college credit while earning high school credit.
Exams: several agencies in the U.S. create and administer exams that are considered equivalent to certain introductory college level final exams. The CLEP Exams are administered by "The College Board" a non-profit agency (www.collegeboard.com). Another Non-profit group (www.ets.org) administers a wide variety of tests, including the challenging but often quite valuable GRE.
Many exams can be taken at Prometric testing centers, Prometric is a for-profit company that administers enough types of general, subject, and vocational exams to boggle the mind.
Step3
Getting into community college or a university early: I have assisted 3 youths in getting into college before graduation from high school - one got an "A" in college psychology 101 when she was 14!
Step4
Some of the challenges of getting into college include:
getting a parent/guardian to sign a form permitting you to take classes at night,
filling out a form regarding your personal information and any other schools you attend,
Getting the permission of the course instructor,
getting the permission of the department chairperson,
getting an evaluation/permission from a college counselor (assessing if the student is mature enough for college classes).
I know that this sounds like quite a chore but in my experience it really only takes 1 to 3 weekday afternoons to sort it all out. Just try to plan ahead and get this done before course registration ends!
It can be work to get in but it can be so valuable - my Son graduated at age 22 with 2 bachelors degrees and earned a masters degree two months after he turned 24!
The other two have done very well also!