Book 1: Navigating Older Water

How would things change if Aang had not been twelve, but fifteen? Would his reasons for being trapped in the ice burg for a hundred years change and most importantly how would the course of Atla change? Read and find out! I will try to keep it as cannon as I can, but I can assure that I'm most likely going to change something somewhere! Expect Kataang in there because come on!