Unfortunately, the teaser for the second season highlights this concern. In the events of Book 2, there is no time skip longer than a month, so Aang should not look much older than he did in Book 1.

All products featured here are independently selected by our editors and writers. If you buy something through links on our site, Mashable may earn an affiliate commission. Oona Chaplin in "Avatar: ...

Contains spoilers for "Avatar: Fire and Ash" There's undeniably a lot to love about the "Avatar" movies. They look incredible, the characters are compelling, and they're filled with the sort of set ...