Tableleg0:
Between the accents and the weird obsession with corporal punishment the English have, a lot of Americans fetishize British people.
Yeah, I realized that when I was a kid and Star Wars came out. The evil ones tend to be British and exceptionally rigid ones as well.
Goodgulf:
So:
5 + grade number = age of student, sometimes +1 depending on when the cutoff date for the local school system.
Here it would be grade number + 5, 6 or 7, depending on if you're born during the spring or fall and the time of the year. When you begin 9th grade you're either 14 or 15, when you graduate from 9th, you're either 15 or 16.