Frankly it leaves me confused what has happened with the ages on the show- and all because of FL&A. My understanding of age in the show has been that with greater control and ability with Chi one can stay stronger and live longer than others. ANd this doesnt necessarily mean your a bender- the Guru seems to have no bending ability but is well over 100 yrs old and going strong
Bumi- 112 years old and yet has muscles that would make the fittest ppl in their 20s gape
Iroh- 60s or 70s (Yes i believe he is alot older than Ozai, who i might add looks alot old in DOBS than in Awakening- different drawing companies) and is now also in the BUmi stage.
AND this is just in terms of muscle strength, when you include how powerful these guys are as benders, so late into life, its staggering AND YET
BAM 58 YEAR OLD Roku (an Avatar, so SHOULD technically live longer than even pwrful benders because of his chi levels) and Sozin (a pwrful FB) looking like they are older than Iroh. But then you add to that the fact that Sozin then ruled for decades afterwards (ive forgotten my numbers, been a while since ive done this, but he apparently lived to roughly 100) and have a KID in his 80s (Azulon died at age 95- at start of the war). I really dont think they planned out their timeline correctly