62Thirdly, according to that case-law, in addition to the fact that that difference in treatment must respond to a genuine need, it must be such as to make it possible to attain the objective pursued and be necessary in order to do so. Moreover, that objective must be pursued in a consistent and systematic manner, in accordance with the requirements of the case-law (see, to that effect, judgments of 12 January 2010, Petersen, C‑341/08, EU:C:2010:4, paragraph 53 and the case-law cited, and of 21 January 2021, INSS, C‑843/19, EU:C:2021:55, paragraph 32).
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