You have to remember that law during the colonial period, and even after the Revolution, was based on English common law, which used "infant" to describe legal status. Other English common law terms used to describe legal status include "age of consent" and "age of discretion." You don't hear those much anymore either.
See Blackstone's Commentary at this link http://avalon.law.yale.edu/subject_menus/blackstone.asp
Donald W. Moore
Virginia Beach, Virginia
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