I am much like peegee. I had friends in high school that I had known since I was 9, but once I moved to college we barely talk. I just don't even think to put in the effort to keep in contact with most people.
Not counting online friends, my longest lasting current friend is at about three years now. Based on precedent, we probably won't talk much after college is over.
I don't make close friends very easily anymore. I tend to like people less the more I am around them. So I do not know how people do it either, pg.