Русско-англо-русский юридический словарь

Simply stated, it means that to be recognized as a person with legal capacity to act, one must have the capabilities to understand the nature and consequences of one’s actions or inactions, or of a decision one may want to make, or contract one may wish to enter. (The Right to Legal Capacity under the UN Convention on the Rights of Persons with Disabilities: Key Concepts and Directions from Law Reform, by the Institute for Research and Development on Inclusion and Society (IRIS))

Adults in this article refer to adults capable of making decisions on their own in other words having legal capacity to act. (De Jure Law Journal, South Africa)

There was some discussion concerning the distinction between being a person before the law and having legal capacity to act. (United Nations General Assembly, DRAFT INTERNATIONAL COVENANTS ON HUMAN RIGHTS)