Lee, This is SO true~ I have found over the years of teaching my boys who are now 15 and 13 that it is even more important to not stress and consider categorizing them into "grades" yet, let them work where they are at and where their abilities and through their own strengths. We work all different levels in different areas because of this, we need to meet our learners at the level they are at not the level we feel they should be
I'm not a college professor, nor is my older student mature enough for campus life. However, we have a wonderful resource called the public library that has millions of college-level nonfiction books on any and every subject. We also can drive to college book stores and buy textbooks - as long as we pay for them, no one cares that we're not actually taking classes! There is also one subject we learn together as if we were fellow students. That is the tightrope we walk with the disparity between my child's age and abilities.