>>33440378All we know is that Trial Captains have to be 11 - 19 because you A.) start the trials at 11 and presumably wouldn't a Captain candidate without having completed them and B.) You have to step down from that position at 20.
Beyond that all we can surmise is that Mallow is probably at the top of that range since she's said to already be thinking about what she'll do afterwards implying she's close to stepping down. The ages for that others aren't even implied beyond that range.
However, I would also note that in general canon between the games and anime don't match up, mostly because time doesn't actually move forward even though it's been stated to. So even if we knew all of their game ages, it doesn't mean we know their anime ages.
I doubt aniMallow is anywhere near 19, for example.
