Mental age is the measure of intelligent development of a person by normal age. For example, a 13-year-old child with learning disability may have a mental age of five. You need to pass some tests to learn your mental age. You know your biological age, but you can not predict your mental age. Here are indications that mental age is different. Do not you get along with everyone? Sometimes what people talk to you is absurd for you. Maybe because of biological age is not the same with mental age! Do you think sometimes you do not have much in common with your peers? It is also true that biological age and mental age are not the same. What is your mental age?