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mental age vs. chronological age

  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.
  1. the number of years a person has lived, especially when used as a standard against which to measure behavior, intelligence, etc.

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