It's true that we recommend screening for breast cancer starting at age 40. Breast cancer, however, can strike at any age. All women should be aware of their personal risk factors. For younger women, this can include: A high-risk lesion found by biopsy A family history of breast cancer, particularly at an early age A family history of cancers or cancer diagnosed at an early age (breast cancer diagnosed before age 50, ovarian cancer at any age, triple negative breast cancer, bilateral breast cancer, male breast cancer, pancreatic cancer or metastatic prostate cancer) If you're concerned, speak with your doctor. They should be able to provide you with guidance on when you should start booking your mammograms.