Quote Originally Posted by Keneth View Post
Q160+ You're right, RAW doesn't mention anything about outsiders not aging as far as I can tell although the fluff in splatbooks uses the word immortal freely when referring to creatures such as devils or celestials, I just extrapolated from there.

Still, I thought I'd ask in case I've missed something. We intentionally don't use any 3.5 material, so it's gonna be up to the DM until Paizo publishes an actual answer.
Well, I don't believe there's an official RAW ruling for that, but the Campaign Setting books make several references to outsiders being immortal in the Golarion Setting. It's likely dependent on the campaign setting you're in.