If they are arranged in descending order of their ages, who will be in the fourth postion?

As per given condition,
Arranging according to age,
Kamini is younger than Rupa.
1. K < R
Pooja is younger than Monika.
2. P < M
Rupa and Monika are of the same age.
3. R = M
Neelam is elder to Rupa.
4. N > R
From 1 and 2,
5. R = M >K or P
from 5 and 4,
6. N > R = M >K or P
Persons are arranged by Age
Neelm > Rupa = Monika > Pooja > Kamini
or Neelam > Rupa = Monika > Kamini > Pooja
Fourth position cannot be determined, if they are arranged in descending order of their ages.