I try bringing this up on this week’s podcast episode and no one seems that interested in doing the actual math.
The only way I can think about this having consequences is if Tarrlock was born with the ability to waterbend after his father had his bending taken away. If people who were once benders can still have bending children, that makes Amon’s struggle much more pointless.
But, either way, I don’t think the specifics of age are that important to the plot of the show.
-Da7e-
