LogFAQs > #959754166

It's iffy. Like there's a strong implication Darunia and Impa died (Darunia being gone when you enter Volvagia's chamber and IIRC Impa going into the well to seal Bongo Bongo but Bongo Bongo breaks out with no word or sign on what happened to Impa). But then on the other hand you have Nabooru + Zelda who are also sages but they're still alive (Zelda needs no explanation while Nabooru gets blasted by the witches, but they also make the comment that they're going to brainwash her again which implies they just teleported her away). Rauru, Saria, and Ruto are sort of in between in that they could be alive or dead, but it isn't made clear.

Edit: On 2nd thought I might be misremembering about Impa. I don't remember if she goes missing in the well or if Sheik says she went chasing BB into the Shadow Temple after BB KOs her + Link.