Dr. Aaron Smith, Ph.D. in Educational Leadership, Currently Program Director at Aviation Academy, Co-Author of Awakening Your STEM School
Elementary school is for students that range from kindergarten to fifth grade. Adults will go to college whether it is a community college (2 year institution) or a college / university (4 year institution).
If a student goes to an elementary school that is public school then there is no cost. However, adults who attend college have to pay tuition, books and sometimes room / board depending on if they are living on campus.
I would suggest that you being to look at colleges and also applying for financial aid. Upon completion of the financial aid, you would then know how much you qualify for and can be used at an institution.