Probably 90% of the people whom I have ridden with through the years and that I am still in contact with are no longer "serious" cyclists. Some have have moved on to rowing, a few got new knees and went back to running. Most have put on a lot weight and doing more sedentary activities. Myself, I am cycling half the miles of what I was 10 years ago, Asthma has wiped out my winter riding, Sailing now competes with summer riding. What riding I'm doing is mostly off-road or on the MUPs.