Is being Co-dependent contagious?

I was brought up in a Co-dependent family, and have tried very hard to get away, emotionally and live my own life, but even the friends I seem to find/have are co-dependent! I think it was because my father physically and mentally abused me and my mother was just a bystander. I try to do my "own thing", but they are aging now and becoming more and more dependent. Any advice? Thanks:)