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
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