Best of luck deciding and now that school has pretty much started everywhere I assume you made the decision. Please let us know what you decided
I think this is one of the hardest choices a parent has to make because it can affect the child for the rest of their life
I too was a 17 year old college freshman, I thought I was very mature and could handle everything, I was unable to go home except for major holidays. I had a blast and luckily I was bright enough to get by more on my writing skills and brains than on my hardwork.
I found everything caught up with me when I graduated college and had to go out to the world of work - I student taught when I was 20 years old - barely older than some of the high school students.
To solve the problem I went back to school for another degree. Matured another year and was ready.
I have now been teaching for 22 years and have seen a lot of students grades
K thru 12 pass through my doors at one time or another. I have NEVER heard a parent say "I wish I had started him/her early but a lot say I wish I had waited"
After watching students behaviour in my classroom (not skill level) I can usually pick out the younger ones and when I check birthdays I am about 98% correct
Good schools have enrichment programs coordinated by specialists in the Gifted and Talented area, also I have seen students move up for certain subject areas such as math and reading but stay with their peers for everything else (just as some move down for some areas)
If a school or teacher is not flexible then I don't know what to advise you - I am fortunate in that I teach in a school system that is rated as one of the best in the nation
It's about the journey and being in the moment, not about the destination