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mental age

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noun Psychology.
  1. the level of native mental ability or capacity of an individual, usually as determined by an intelligence test, in relation to the chronological age of the average individual at this level: a ten-year-old child with the mental age of a twelve-year-old; a mental age of twelve.

Origin of mental age

First recorded in 1910–15
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for mental age

mental age

noun
  1. psychol the mental ability of a child, expressed in years and based on a comparison of his test performance with the performance of children with a range of chronological agesSee also intelligence quotient
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

mental age in Medicine

mental age

n.
  1. A measure of mental development as determined by intelligence tests, generally restricted to children and expressed as the age at which that level is typically attained.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.