Isn't he too old for her?

Well here it is: my friend is 16 her "friend" is 23 years old. I told her that she shouldn't be seeing him cause he is 23 and her mom or no one would approve of it so she got mad and said that I am a wh*re and that I f*ck anything that comes in front of me. I am a virgin and will be until I find the right one. Well we stopped talking today cause she said that I am only on Depo so that I can f*ck a boy name Dennis and I told her that I am on it to see if it stops my period and she said that I am on it so I can f*ck Dennis and don't I love Donte and have no feelings for Dennis anymore at all. I just like him as a friend but I need to know was I in the wrong to tell her that she needs to stop letting every boy get to her and that she is wrong for f*ckin around wit a 23 year old man that she doesn't know and that only wants her pu*sy??? I need help I've known her since I was 3 and she is like a big sis that I can tell anything to and I stopped messing around wit the boy Dennis cause she said that all he wanted was sex so was I right or wrong about asking her to stop talking to Wayne?

Point is......she is a fool and if she doesnt want to listen to you then thats her problem. And if he gets caught having sexual contact with a minor he risks being charged and maybe going to jail, but if they are to immature to care then who cares, not your problem you have done what you need to do.