Avatar Spinoff Series Announced

>70 years in the future
>Teenage avatar running around

Aang died roughly at the age of 62, assuming instant reincarnation.

Still, they couldn't have had it take place 100 years later? What caused Aang's presumable preemptive death? D:

aang is 12 in the series, 13 arguably.
70 years pass and theres a new avatar, female water bender.
figure he was 12 when he was told he was the avatar, so account for the years where the new avatar had to grow up and find out she's the avatar, and then for the time where she learned the other three styles already.
that all makes me think aang died in an accident or something similar, and was younger than 62 when he died.

what i want to see most is what became of toph after she realized metalbending, and how it impacted the world. perhaps sparked an industrial revolution?