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English definition of “mental age”

mental age

noun [C usually singular]    
A person's mental age is a measurement of their ability to think when compared to the average person's ability at that age: Although Andrew is 25, he has a mental age of six.Mind and personalityScience of psychology and psychoanalysisIntelligencePerceptive
(Definition of mental age noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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