The GP takes it quite serious if there has been breast cancer history on your Mother's side of the Family. Therefore usually you can have a mamogram at an earlier age in your 20's
This applies if you have a history of breast cancer or ovarian cancer in either your Mother or your Father's side of the family. There are a few indicators they look at such as the age at which the family member got cancer.

If you meet the criteria, you can get an appointment to a familial cancer centre who can work out your risk of getting cancer, and assist in getting screening mamograms etc.

For info on familial cancers, see the brochures at GHSV and contact your local genetic centre.
Genetic Health Services Victoria