**** em, people only say stuff like that because they're insecure and want to feel better about their own shortcomings by belittling others.
This friend of yours was obviously worried about what the ******** was gonna say about her so when he said you looked young she was probably really relieved and kept on referring to it to keep the focus off her.
It's a bitch when you get into a rut like this, but try and improve things for yourself, maybe by introducing something new into life (join a gym, go to dance classes, whatever) you might spark some more positive feelings, and a change is always good. It might help give you some more control over things, which in turn will boost your confidence. Good luck chick. D