STRØBYE AND ROSENLIND v. DENMARK JUDGMENT Kingdom [GC], no. 24833/94, § 63, ECHR 1999-I; see also Labita v. Italy [GC], no. 26772/95, § 201, ECHR 2000-IV, and Podkolzina v. Latvia, no. 46726/99, § 33, ECHR 2002-II). ... 62. It is, however, for the Court to determine in the last resort whether the requirements of Article 3 of Protocol No. 1 have been complied with; it has to satisfy itself that the conditions do not curtail the rights in question to such an extent as to impair their very essence and deprive them of their effectiveness; that they are imposed in pursuit of a legitimate aim; and that the means employed are not disproportionate (see Mathieu-Mohin and Clerfayt, p. 23, § 52). In particular, any conditions imposed must not thwart the free expression of the people in the choice of the legislature – in other words, they must reflect, or not run counter to, the concern to maintain the integrity and effectiveness of an electoral procedure aimed at identifying the will of the people through universal suffrage. For example, the imposition of a minimum age may be envisaged with a view to ensuring the maturity of those participating in the electoral process or, in some circumstances, eligibility may be geared to criteria, such as residence, to identify those with sufficiently continuous or close links to, or a stake in, the country concerned (see Hilbe v. Liechtenstein (dec.), no. 31981/96, ECHR 1999-VI, and Melnychenko v. Ukraine, no. 17707/02, § 56, ECHR 2004-X). Any departure from the principle of universal suffrage risks undermining the democratic validity of the legislature thus elected and the laws it promulgates. Exclusion of any groups or categories of the general population must accordingly be reconcilable with the underlying purposes of Article 3 of Protocol No. 1 (see, mutatis mutandis, Aziz v. Cyprus, no. 69949/01, § 28, ECHR 2004-V).” 92. In addition to the principle above about the margin of appreciation being wide in this area, the Court recalls that the quality of the parliamentary and judicial review of the necessity of a general measure, such as the disputed disenfranchisement imposed as a consequence of declaring a person legally incompetent, is of particular importance, including to the operation of the relevant margin of appreciation (see, among others, Animal Defenders International v. the United Kingdom [GC], no. 48876/08, § 108, ECHR 2013 (extracts), and Correia de Matos v. Portugal [GC], no. 56402/12, §§ 117 and 129, 4 April 2018). 93. Another factor which has impact on the scope of the margin of appreciation is the Court’s fundamentally subsidiary role in the Convention protection system. The Contracting Parties, in accordance with the principle of subsidiarity, have the primary responsibility to secure the rights and freedoms defined in the Convention and the Protocols thereto, and in doing so they enjoy a margin of appreciation, subject to the supervisory jurisdiction of the Court. Through their democratic legitimation, the national authorities are, as the Court has held on many occasions, in principle better placed than an international court to evaluate local needs and conditions (see, inter alia, Lekić v. Slovenia [GC], no. 36480/07, § 108, 11 December 2018). (b) Application of the general principles to the present case 94. In the present case the applicants had been declared legally incompetent. Consequently, they were disenfranchised and prevented from 27