noun
EXAMPLES FROM CORPUS
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A medical report estimated she had a mental age of seven years and nine months.
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A person of 18 with Down's syndrome and a mental age of four, living with his or her parents?
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A.. There are some people whose physical and mental age is a whole lot younger than their nominal age.
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Children with a mental age of 3 years and above can understand the principle and benefit from its use.
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Daughter Helen, 25, needed constant attention after whooping cough left her with a mental age of just two.
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George Mayo is sixty two, but only has a mental age of six.
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Most of the boys' mental age is about eleven.
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The most pathetic case was that of a middle-aged man with the mental age of a child of nine.