The one big complication is that one of the teachers must have done some whole class activity that involved their birth dates, so the whole class knows who is the youngest and we can't skirt the question that way.
My DD13 and her Biology teacher unintentionally learned a lesson about de-anonymization of data. Two years ago, when my (twice skipped) DD was in 8th grade, she was part of a pilot program where 8th graders could take a handful of HS courses. The HS biology teacher thought it would be helpful (and it was) to plot birth year and grade for all of his classes to show that the 8th graders were succeeding. Way off to the left of the chart is a lonely data point for DD. Oops. Luckily she had a fairly high grade, so it was less embarrassing than it could have been. And what was even cooler is the biology teacher did not know he had an accelerated kid in his class until then.
As for the age/grade questions - we always seem to get them in pairs. As in, "Your daughter is how old?" ... "So that would put her in X grade?" Urgh. Just ask one question or the other and we can sneak by... We have various go to answers: she went to a great private school, she is a fast learner, look over there - an eagle!
--S.F.
