Glad to see the interest. The age range would begin at 16 and would usually be up to 18 (it would have been unusual for nobles not to educate their children in magic after they turned 18 but not entirely uncommon) although a maximum age of 23 or so would not be an issue.

The peace itself was signed two years before but the fighting actually only stopped as news was carried out a year before the RP started. Construction on the Academy began almost from the moment the treaty was signed so it shows a lot of Fristhan and Elianstan architecture (using sandstone, marble, large stone blocks as opposed to small bricks with quite elaborate decoration) in the main building while others (such as the hunter's lodges, pavilions etc) are more varied.