I think that I heard somewhere that there were 7 of them
True. In OOT, there is seven sages. Rauru, Saria, Darunia, Ruto, Nabooru, Impa and Zelda. Zelda is the seventh sage, as she herself claims.
Now, I think that it's more likely that there are multiples sages. We have the seven sages in OOT, then Kaepora Gaebora (the Owl) which is the reincarnation of an ancient sage. And the two sages in WW. Fado the Wind Sage, is not Saria, because he is a boy and he has blond hair. Laruto could be Ruto, but I don't think that's possible. I think Nintendo wanted to make two new sages, rather than taking old ones. Also, those two are respectively the Wind and the Earth Sage, and not the Forest and Water.
In TP, which is believed to be on the child timeline, the sages were the previous sages before OOT. And Kaepora could be one of them, since he was probably from that era of sages.
I might be missing a few sages that appear in other games, but that's pretty much what I know.
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