Time works differently in the outer planes, if at all.
My understanding is that there is no aging.
Do you want them to age?
Traditionally, angels aren't depicted dying peacefully of old age surrounded by a dozen grandbabies.
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All non-native Outsiders, broadly speaking, are immortal.
The typical aging chart really is intended for standard mortals and doesn't precisely apply to immortal or functionally immortal Outsiders. I personally just wouldn't use the standard mortal aging rules and age categories to apply to them. If I were inclined to use aging rules for them I'd make something unique to each particular 'species' of outsider in question, but it's honestly a lot of work for something that doesn't particularly seem particularly relevant in their cases, but nothing stops you of course if you think it would add something to your campaign.
It may be implied in the bestiaries that some outsiders evolve into the higher CR ones over the course of their existence, pokemon style.
Some just come into form as the result of a powerful soul dying.
Some are created.
Sh*t happens, man, it's crazy in the multiverse.
According to the Planescape setting, archons and aasimon (devas, planetars and solars) are ageless and immortal, having been transformed from the souls of LG or any G mortals. Baatezu and tanar'ri are similar for LE and CE souls.
Guardinals (the NG animalian celestials) are, as I recall, long-lived true-breeding outsiders, whereas eladrin are formed from the souls of CG mortals, but whilst presumably ageless, are not immortal (they have multiple-century lifespans though).
Asuras, on the other hand, are also CG, but aren't transformed souls and have fairly short lifespans. They also sometimes come about from archons who have strayed away from law into chaos, just as guardinals occasionally come about from archons who become NG instead of LG.
(I believe that the above is right - it's been a while since I read Warriors of Heaven and it's a fairly complicated celestial ecology, all told!)
According to the Planescape setting, archons and aasimon (devas, planetars and solars) are ageless and immortal, having been transformed from the souls of LG or any G mortals. Baatezu and tanar'ri are similar for LE and CE souls.
Guardinals (the NG animalian celestials) are, as I recall, long-lived true-breeding outsiders, whereas eladrin are formed from the souls of CG mortals, but whilst presumably ageless, are not immortal (they have multiple-century lifespans though).
Asuras, on the other hand, are also CG, but aren't transformed souls and have fairly short lifespans. They also sometimes come about from archons who have strayed away from law into chaos, just as guardinals occasionally come about from archons who become NG instead of LG.
(I believe that the above is right - it's been a while since I read Warriors of Heaven and it's a fairly complicated celestial ecology, all told!)
Warriors of Heaven however took a gigantic and honestly weird number of liberties with Planescape material. I personally don't consider it canonical for the setting. *shrug*
Fwiw my post higher up was only using Pathfinder sources.