Mr. X with his eight children of different ages is on a family trip. His oldest child, who is 9 years old saw a license plate with a 4-digit number in which each of two digits appear two times. The number is evenly divisible by the age of each child, and the last two digits happen to be Mr. X's age. Which of the following is not the age of one of Mr. X's children?

A

4

B

5

C

6

D

7