If a physician examines someone whose age he doesn’t know he can make a good estimate of his age because he understands the aging process and know long it would take his patient to reach his current physical condition. But what would happen if he traveled back in time and examined Adam a few days after his creation and tried to guess his age? If he didn’t know Adam had been created directly by God he would assume he had been born as a baby and grown to adulthood. His estimate of Adam’s age would be much too high. His error wouldn’t be the result of any incompetence on his part but it would occur because of his lack of historical knowledge of Adam’s past.