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The English phrase "Declaration of age of Pedro II", doesn't work as a title for this article. By policy: because it fails WP:PRECISE; as a translation: because this does not mean that he has legal majority. For example: an official paper signed in 1831 stating that "Pedro II is six years old" would also be a "Declaration of age of Pedro II".
The prepositional expression "of age" can mean "majority" in English, but only when following a copula verb, for example: "being of age", "is of age", "come of age", "declared of age", "became of age". It loses that sense of legal majority (adulthood) following a noun: "years of age", "effect of age", "on account of age", "declaration of age", none of which have anything to do with legal majority. This title will have to change, preferably using the expression used in English reliable sources. Maybe these links will help: