Q:

A, B, C, D, E and F are cousins. No two cousins are of the same age, but all have birthday on the same date. The youngest is 17 years old and E the oldest is 22 years old. F is somewhere between B and D in age. A is older than B. C is older than D.
 Which of the following statement is not possible?

• 1
  F is 18 years old
• 2
  F is 20 years old
• 3
  D is 20 years old
• 4
  F is 19 years old