How old is Vaan in ff12?

Could you please elaborate on the age of Vaan, the protagonist in Final Fantasy XII? I'm curious to know if there's a specific age mentioned for him in the game's official lore or if it's left ambiguous. His youthful appearance and actions often suggest he's still in his teenage years, but I've seen conflicting information on the internet regarding his exact age. Clarifying this detail would help me better immerse myself in the game's story and character development. Thank you for your assistance in this matter.