Gunnar Dybwad on Mental Age

Don't say "IQ testing", but say "psychological testing," because the most important thing was the mental age. The concept of mental age, that we were dealing with children you see, that was the great misunderstanding, you see.

And so we thought these were child-like people. The I.Q. is confusing. It's this concept of the mental age that he had the mental age of six and therefore would behave like a child of six, which was nonsense.

Because no child of six weighs 130 pounds and has lived 22 years. And living 22 years makes you a different individual than living 6 years.