Wait, am I the only one who think that Ava and Gula are teen masters? (Probably around the same age as KH3 Sora or Riku)
On the other day, I was watching the JP ver of BC (yeah, through the streamers in YT). When Gula is about to take him down, Aced says "don't you underestimate me!" and calls Gula kozou (小僧) which can be translated as brat/kid.
Okay, on the screenshot I got, (if directly translated) he says, "Don't you underestimate me, you brat!!"
Basically, not giving the vibe that Gula is younger than him, but also Gula is younger than we thought, given that we always thought he is... umm... early twenty. Judging from that, I doubt that he is and Aced doesn't just refer to him as such just because he is younger than him.
But idk this is just my thoughts. *shrugs*