The devs might be German, but the game is clearly set in Japan. This is how I came up with the ages for my game. You don't have to agree if you don't want to. The MC and his classmates are nearing the end of Middle school, and Emily just started middle school. Middle school age is 12-15 in Japan. Also, if the mom is 33, then she got pregnant at 17 which is a little older than Alyvia is now. MC was born shortly after Alyvia. So, Emily is 12, MC is 15, and Alyvia is 16. Viktoria is currently 15 but will turn 16 in the next update, so I set her to 16 since the dialogue in the new update is about how old she will be, not what she currently is.