non ag

from Bouvier's Law Dictionary, Revised 6th Ed (1856)
NON AGE. By this term is understood that period of life from the birth till 
the arrival of twenty-one years. In another sense it means under the proper 
age to be of ability to do a particular thing; as, when non age is applied 
to one under the age of fourteen, who is unable to marry. 
    

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