Seven friends A, B, C, D, E, F and G, each has a different age. C is older than D. B is the oldest among all. E is older than G but younger than F. G is older than C. Only two people are younger than C. D is not the youngest. How many persons are younger than E?

4

1) C is older than D 

⇒ C > D

2) B is the oldest among all 

3) E is older than G but younger than F 

⇒ F > E > G

4) G is older than C

⇒ F > E > G > C > D

5) Only two people are younger than C 

⇒ F > E > G > C > D > A

6) D is not the youngest

So, the correct order will be ⇒ B > F > E > G > C > D > A 

So, there are 4 persons (G, C, D and A) younger than E.