Raymond Smullyan and Social Security's Actuaries

According to Raymond Smullyan:

Many years ago, I was teaching an elementary algebra course. On one exam, I had a standard-type question that involved finding the ages of a mother, father, and child. After the students read the question, I said, “On this problem, I'll give you one hint.” All eyes eagerly turned to me. I continued, “If the child should turn out to be older than either of the parents, then you've done something wrong.”

The actuaries of the Social Security administration did something wrong.