I have very little contact with people from high school simply because I, like Brad, attended a small high school. People all went their separate ways after it was done. I don't think this means anything at all. I think it's more the exception that someone hangs out with high school friends throughout their adult life.
I still have my high school and sorority friends and they live all over the country and 2 are out of the country. We had formed a bond, tho. I am now 60 yrs. old.
Different strokes for different folks, I suppose.