Going to Faerie is different than having someone from Faerie visit you. Gandalf doesn't bring Faerie. Gildor brings a taste of it, but I doubt that Frodo, Sam, & Pippin stopped aging when they were with him.
If they ahd stayed for a month with Tom Bombadil, would they have aged then? I wonder.
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...down to the water to see the elves dance and sing upon the midsummer's eve.
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