Noun
the level of intellectual development as measured by an intelligence test
Source: WordNetA third prisoner, Tamaeli, was about 16, but had a much younger mental age, and little English, because of which he was more frequently physically abused by Larsen. Source: Internet
Individuals with the lowest mental age level (less than three years) were identified as idiots; imbeciles had a mental age of three to seven years, and morons had a mental age of seven to ten years. citation. Source: Internet
For example, a six-year-old child who passed all the tasks usually passed by six-year-olds—but nothing beyond—would have a mental age that matched his chronological age, 6.0. Source: Internet