Since I can't decide what to do about this, I turn it over to you, loyal readers, to decide how I should handle this.
How shall I deal with the dating discrepancy?
We're talking about two series where time travel is canon. Problem solved.
The BHH teens are in their early 20s now. The closing of the school coincides with the flight of the Dauntless.
Arbitrarily decide that SJA takes place in the early 00s
Arbitrarily decide that BHH takes place now. Ignore all the canon evidence to the contrary.
Treat it like UNIT dating. Handwavy are us.
Some other creative idea that I will explain in comments.
Radio buttons are love.
Where is Black Hole High?
Canada (where it was filmed)
Washington, DC (where the bigbang is set)
It was originally in Canada but moved to Washington after the events of Conclusions
In this ticky box (which is a tesseract)