Having one GT son age 20 and one GT son age 15 as well as a wife who teaches the subject and having contact with a lot of parents directly, I think that as GT kids get older, a few things happen:
1. They slowly find their way. Never completely comfortable or satisfying mind you, however, enough to where were not desperate for help / input / guidance.
2. Things tend to get better and GT kids tend to find those of like mind the older they get. The problems, especially social-emotional, often diminish somewhat.
3. Parents eventually realize it doesn't matter how much injustance there is, it doesn't matter how hard they fight the good fight, it doesn't matter what we do, we're simply not going to find any one school or organization that is going to fill the needs of our gifted child, it's WE that has to create the opporunities. In short, we cry for help less and create our own having no other better option. (We don't start out seeing ourselves as the best option usually, however, realize eventually we might very well be)
It doesn't surprise me that the frequency of posts goes way down as GT kids get older. The school systems too seem to think that as kids get older their need for gifted services disappears, unfortunately that couldn't be further from the truth. Simply because AP course become an option doesn't mean all is solved, not by a long shot.