Discrimination is normally only allowed under European law where the discriminatory measure can be objectively justified; this means showing that the measure is an 'appropriate and necessary' way of achieving a legitimate aim. UK legislation giving effect to European law contains similar provisions . The ECJ, in Fuchs v Land Hessen  077 PBLR - (ECJ Case C 159/10), has ruled that a mandatory retirement age can be objectively justified on the grounds of "establishing a balanced age structure in order to encourage the recruitment and promotion of young people, [and] to improve personnel management." So justified, a mandatory retirement age would not constitute unlawful age discrimination. The court also held that for the policy to be appropriate and necessary 'it must not appear unreasonable in the light of the aim pursued'; it must be supported by solid evidence that the measure will favour the legitimate aim. It is for national courts to determine if the policy is indeed appropriate and necessary to achieve the stated aim.