Eramis and Taniks were both alive back during the Fallen's Golden Age, and both seemed to still be in their physical prime when we killed them (Taniks before he lost is original body).
Given that the Fallen's Golden Age was at least several centuries ago, this can only mean the Fallen have an extremely long lifespan.
Awoken live a long time, but goddamn the Fallen live a lot longer.
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Whirlwind [couple hundred years as the traveler isn’t said to move fast] —> golden age [said to be a few centuries] —-> where we are now I think its honestly just plot armor the whirlwind was a extremely long time ago