Well, I think Ruto's exact words were that she couldn't marry because she had to watch over the Water Temple. Maybe when Ganondorf was defeated, the Sages didn't have to watch over the Sage Temples. They remained Sages, but they could get married and have children as well, which ment that their children would become the new sages.

As for them being the 'Earth and Wind' sages, maybe the new sages assumed a different title than their parents. Who knows? Maybe Darunia's descendant became the Sage of Ice and Nabooru's descendant became the Sage of Magma. I don't know. Either way, I think it makes sense.

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