bizukos:The Storm (Book 1:08):At the age of 13 Zuko refused a duel with his merciless father.
bizukos: The Storm (Book 1:08):At the age of 13 Zuko refused a duel with his merciless father. Sozin’s Comet, Part 4: Avatar Aang (Book 3:21):At the age of 13 Aang showed Ozai the mercy he could not give to his own son. -- source link