The Concept of Mental Age Is Not Really Used in Modern

The concept of mental age is not really used in modern tests of intelligence. Why is this the case?

A) mental age cannot be normally distributed
B) mental age does not reliably show up in factor analysis
C) mental age is appropriate for children, but is not really applicable to adults
D) mental age cannot be measured accurately
E) while the WAIS uses mental age, the WISC does not