SSC JE Mechanical 11 Oct 2023 Shift 2 Paper

There are seven family members Q, R, S, T, U, V and W. Each are of different ages. R is elder than only three other members. S is younger than V but elder than W, who is the youngest among all. Q is elder than R but younger than U. U is not the eldest among all.
How many family members are there between Q and W?