Celestial Aysse more or less live forever since they're really just a bunch of sentient energy that give themselves bodies, but killing the body wouldn't kill them permanently, they'd just re-form it after a time. You'd need to kill the body and then somehow dissipate the energy once its released.
Corporeal Aysse are totally bound by their bodies, though. I always pictured them living maybe 100-200 years??? Maybe a little longer?? Like longer than normal animals but not really that long in the grand scheme of thing.
AND NO I LOVE YOUR QUESTIONS THANK YOU!!!! I'm planning on re-doing the sheet so this is all good stuff to think about!! Thank you!!!