Mental Age In categorizing children of different abilities Binet developed a scale of units he called mental age. A Child’s intelligence was determined by the mental age level which he could attain on the test. A ten years old child who was able to all the tests meant for ten years old children was said to be normal or average. If he could do the test meant fora higher age level his mental age was said to be more than his chronological age and he was described as a
131 bright child. If he was unable to do the tests meant for his own age level, the child’s mental age was said to be lower than his chronological age and he was described as slow or retarded. Mental age is a simple and useful concept. You can easily interpret it, when deal with children differing in metal ability.