55As regards length of service, which is the subject of specific appraisal when the fourth question is answered (see, in particular, paragraphs 61 to 65 of this judgment), it need only be pointed out here that although, as the Advocate General observes in point 50 of her Opinion, length of service goes hand in hand with experience and generally enables workers to perform their tasks better, the objectivity of such a criterion depends on all the circumstances in each individual case (see, to this effect, Case C-184/89 Nimz [1991] ECR I-297, paragraph 14, Gerster, cited above, paragraph 39, and Kording, cited above, paragraph 23).
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