Basically, which characters in any Final Fantasy game had you thinking that their official ages were highly innacurate, and what did you think their actual ages were.
For me:
Balthier (FFXII): Officially 22, to me seemed more late twenties, 27/28, mostly because of his voice, face and general attitude.
Reddas (FFXII): Officially 33 (!), I'd place him much, much older (forties at least).
Larsa (FFXII) (Noticing a pattern here?) : Officially twelve, I'd peg him at a few years older, maybe 14/15?
Vanille (FFXIII): Officially 19, I assumed her to be about 15/16 from her childish attitude.
Squall and Quistis (FFVIII): Officially in their late teens, I'd put them at early twenties.
That's all for now. What about everyone else?