Seven friends A, B, C, D, E, F and G study in the same college. F and G are second eldest and eldest respectively, between them. E is elder than only A and C. D is the fourth eldest. A is not the youngest. How many friends are older than E?

4

 F and G are second eldest and eldest respectively

G, F, -, -, -, -, -, 

E is elder than only A and C and A is not the youngest

G, F, -, -, E, A, C, 

D is the fourth eldest

G, F, -, D, E, A, C, 

So we have found the position of B

G, F, B, D, E, A, C, 

we can clearly see that only 4 friends are older than E

NOTE: The positions are arranged from older to younger.