43Although Member States retain the power to organise their social security schemes, they must nonetheless, when exercising that power, observe EU law, including the provisions of the Protocol and the Staff Regulations which relate to the social security rules governing the legal position of EU officials, both during their service with an institution and after pensionable age (see, to that effect, judgment of 10 May 2017, de Lobkowicz, C‑690/15, EU:C:2017:355, paragraphs 34, 38 and 39 and the case-law cited).
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