opinons

hey everyone :)
one of my good friends is having problems with her weight. i keep telling her that she is not fat but she chooses not to listen. she's been asking me what i think the average girl(17-18) should weigh. she is 17 now but will very soon turn 18. she told me that last time she weighed herself she was 172 somewhere around there. but i dont exactly know what a 17-18 year old girl should weigh...meaning the average/good weight so i told her that i would ask some people and i figured that here would be a good place to get multi-opinions. so i would appreciate everyones opinoin so i can try to help here....thanx :)

At 172 she is probably overweight. But it all depends on her height and build much more than her age.

oh...i forgot to mention that. i believe she is either 5'7 or 5'8.