Impa was in The Legend of Zelda, Zelda II: Adventure of Link, Ocarina of Time, Oracle of seasons, and Oracle of Ages, and Skyward Sword (Twilight Princess if you consider Impaz the same as Impa). I do not see all of these events and constant changes in Hyrule happening in one lifetime. In order for her to meet all of the different Zelda's and Link's they would have to have kids, do their calling, and die by the time they were teenages (if that). It just does not make sense to me how people could get that impression.