Breast cancer is a very common cancer in women and one of the most common cancer-related causes of death. It has a better prognosis the earlier it is detected and so for many years, women have been encouraged to examine themselves.
This should start at a young age so that women are familiar with their own bodies and the changes that happen cyclically. It is not often that a young woman will find a change and even then with further exploration an innocent cause is often found.
Only 20% of breast cancer occurs in women below the age of 50, and much of that would be between 40 and 50.