[quote=Baklava]
The theory being that Impa is the name of every (female?) leader of the Shiekah. Not so much that the name itself is passed down, which it obviously is-- just like Zelda. It's been the name of each of Zelda's caretakers but I'm pretty sure Impa isn't the leader of the Shiekah in every one. After she became a sage in OOT, she had other responsibilities anyway so it's actually quite likely they would have elected a new leader. They probably did it after she was elected to be Zelda's nursemaid actually. It's unlikely she was both at the same time.
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Its just that she can live super long from what Skyward Sword shows. But I'm not saying its the same one from then. Its the Impa from the actual game. Well the Sheikah are considered mostly extinct by Ocarina and by Wind Waker Impaz is the only remaining person with Sheikah blood. Which is why I named Idris and everyone else applying for Sheikah are saying they are the last of the race. Sheikah get pretty fucked over in LoZ and its sad cause they are so interesting. Well in A Link between Worlds, Impa is watching over Zelda. The true sad part is in every timeline, the Sheikah are either mostly extinct or completely extinct.