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... aetate aut rudis pueritiae [aetas], quique sibi quique aliis...

To (I hope) clarify the syntax, without the bracketed "aetas," both phrases, "fessa aetate" and "rudis pueritiae," describe "feminarum," but the first is an ablative of description, the second a genitive of description, " the lamentations of fearful women...of inexperience youth."