1) Developmental psychology 2) Index of intelligence 3) Intelligence test finding 
Mental age is a concept in relation to intelligence, expressed as the age at which a child is performing intellectually. The mental age of the child that is tested is the same as the average age at which normal children achieve a particular score. However, a mental age result on an intelligence test does not mean that children function at their `....
intelligence test score, expressed as the chronological age for which a given level of performance is average or typical. An individual`s mental age ... [1 related articles]
A measure, expressed in years and months, of a child's measured intelligence relative to age norms as determined by testing with the Stanford-Binet intelligence scale. ... (05 Mar 2000) ... 
the age level of mental ability of a person as gauged by standard intelligence tests.
(MA) Type: Term Definitions: 1. a measure, expressed in years and months, of a child's intelligence relative to age norms as determined by testing with the Stanford-Binet intelligence scale.
[n] - the level of intellectual development as measured by an intelligence test
a measure of a person's ability to think and reason as determined by psychological or educational testing. The level of the person's intelligence is expressed as the age at which most people would think and reason at the same level. (For example
noun the level of intellectual development as measured by an intelligence test
The chronological age that typically corresponds to a particular level of performance. It is used as a measure of performance on intelligence tests.