"Respectively" is used correctly enough, but two things come to mind. People over 80 are also over 60, which makes nonsense of the sentence. We can easily figure out what you mean, but it is the writer's duty to be clear, not the reader's to guess.
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"Respectively" is used correctly enough, but two things come to mind. People over 80 are also over 60, which makes nonsense of the sentence. We can easily figure out what you mean, but it is the writer's duty to be clear, not the reader's to guess. Also, whenever you find that you have written "respectively" (or "former/latter"), recast the sentence. Prose isn't algebra.