Okay, so we all know the avatar timeline is f'd up.

For example, how could Roku's son (pictured here) be in his 20's when Roku died his daughter Ursa was around her mid-to-late 30's over a hundred years later?

For one side of the argument, let's say Ursa was about 40 when Aang was found by Katara and Roku's son was 20 when Roku died. Now, at the time Aang was frozen, Roku's son would be 32, which means, if Ursa was 40 when Aang was found, Roku's son would be around the age of 90 when he conceived her.

On Sozin's side, we have Sozin being about 65 to 70 around the time of Roku's death. It's possible he lived to the age of 100, which would be about 23 to 18 years after the war started. For the sake of Avatar's integrity, lets say it was 23 (I know this likely isn't Sozin's age. This is just my best guess based on a vague memory of maths after the canon destroyer that was Escape From the Spirit World). Now, Sozin's son Azulon could possibly (very unlikely, but possibly) have been born during that time. Let's say he was born 3 years after the start of the war. (, I know, but what can you do?) This would leave him at 20 when he became Fire Lord. Now, fast forward to the time of Azulon's death, around 70 years later. This would leave Azulon at 90, and with Ozai being 40 at best, Azulon BIRTHED him at the age of 50. More likely then Roku's son, but still quite odd. And I've heard the Nickelodeon website (Not that I'd tread there myself) says Azulon only ruled for 40 years. So what happened to the other 30?

It's weird thinking how easily this could have been avoided had another generation been added at some point...