Case C-52/22, BVAEB (Adjustment of retirement pensions): Judgment of the Court (Seventh Chamber) of 20 April 2023 (request for a preliminary ruling from the Bundesverwaltungsgericht — Austria) — BF v Versicherungsanstalt öffentlich Bediensteter, Eisenbahnen und Bergbau (BVAEB) (Reference for a preliminary ruling — Social policy — Equal treatment in employment and occupation — Directive 2000/78/EC — Prohibition of discrimination on grounds of age — Article 2(1) and (2)(a) — Article 6(1) — Retirement pension — National legislation providing for a gradual alignment of the pension scheme for civil servants with the general pension scheme — First adjustment of the amount of the pension being made more quickly for one category of civil servants than for another — Justification)