JIM is the oldest
Tom (A) is younger than Rose (B) but older than Will (C) and Jack (D) in that order. = B<C,D
Rose (B) is younger than Susie (E) but older than Jack(D) . = E<B<D
Jack(D) is younger than Jim(F). = F<D
Susie(E) is older than Rose(B), but younger than Jim(F). = F<E<B
Jim(F) is older than Tom(A). = F<A
Putting all together, F<E<B<A<D<C
That is, JIM<SUSIE<ROSE<TOM<JACK<WILL.