How Old Are You?

"How old are you?" Inquired the visitor to the college professors son. "That's a difficult question," answered the young man removing his sunglasses and wiping them for the smallest of smudges. "The latest personal survey available shows my physiological age to be 12, my moral age, 4, my anatomical age, 7, and my physical logical age, 6. I suppose, however, that you were referring to my chronological age, which is 8. That is so old-fashioned that I seldom think of it anymore."