mental age n a measure used in psychological testing that expresses an individual's mental attainment in terms of the number of years it takes an average child to reach the same level
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a measure of the intellectual level at which an individual functions; for example, someone described as having a mental age of 6 years would be functioning at the level of an average 6-year-old child. This measure has largely been replaced by a comparison of the functioning of persons of the same age group (see intelligence quotient, intelligence test).
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the score achieved by a person in an intelligence test, expressed in terms of the chronological age of an average normal individual showing the same degree of attainment.Medical dictionary. 2011.