Question: how old are aang and his friends?
Answer: Only five of the characters throughout the series have their age explicitly mentioned: Aang is 112 (though only 12 biologically), Zuko and Yue are 16, Toph is 12, and Tom-Tom (Mai's brother) is 2. It is also mentioned by Ty Lee that Mai is fifteen years older than her brother, which would make her 17.