Mammogram Age Guidelines: What You Need to Know
Featured Expert
Updated July 20, 2026
Annual mammograms are the best way to detect breast cancer early, when treatment is most effective. Yet changing national guidance about what age to start – from 40 to 50 and now back to 40 again – can be confusing.
Pouneh Razavi, M.D., director of Breast Imaging in the National Capital Region, oversees breast imaging operations at the Sullivan Breast Center at Sibley Memorial Hospital and Johns Hopkins Medical Imaging in Bethesda. She cuts through the clutter with clear advice for breast cancer screenings.
Key Points
- Annual mammograms should begin at age 40 for women at average risk, as recommended by the Society of Breast Imaging, because 1 in 6 breast cancers occur between ages 40 and 50.
- Expert interpretation by a dedicated fellowship trained breast imager and AI support improve accuracy. Johns Hopkins breast radiologists use advanced AI software as a second reader when interpreting mammograms.
- Studies have shown that when AI software is used as a second reader, it can help reduce false positives and help diagnose early breast cancers.
- Screening may need to start earlier depending on personal risk factors, overall health, breast density and guidance from a physician. It is important for each patient to know and discuss her risk factors for breast cancer with her primary care physician. For patients at a higher risk for breast cancer, supplemental screening to the annual mammogram will include Breast MRI.
What are the latest national guidelines for breast cancer screenings?
A: The Society of Breast Imaging recommends that a woman at average risk for breast cancer women begin getting annual mammograms at age 40.
Why should screening mammograms begin at 40 – not at 50 – years of age?
A: Data shows that one out of six new breast cancers develop in women who are in the age range of 40 to 50. Cancers detected during screenings are usually early-stage, and the earlier we catch a cancer, the better the prognosis and survival rate for the patient.
At Johns Hopkins, we have always recommended that our patients start screening at age 40.
Can false positives be reduced in mammograms?
A: At Johns Hopkins Medicine, every mammogram is interpreted by fellowship‑trained breast radiologists, and enhanced with AI technology at no extra cost. The AI review is used to support radiologists and help increase the accuracy of screening results. Learn more about AI and mammograms.
Should some people start getting mammograms before the age of 40?
A: Yes. We always tell patients to have this conversation with their gynecologist or referring physician. For example, patients with a higher-than-average risk, for example because they have a family history of breast cancer or known genetic mutations such as the BRCA gene, are generally urged to start earlier and supplement the mammogram with Breast MRI.
Is there an age when women no longer need breast cancer screenings?
A: The guidelines do not include recommendations for women after age 74, as there is limited data on whether mammograms save lives in that age group. But we have patients who are much older than that and healthy, who would benefit from early detection that would inform treatment decisions. As long as the patient is in good health otherwise, we recommend that they continue getting annual mammograms.
What is the current mammogram guidance for women with dense breasts?
A: Updated Food and Drug Administration regulations require mammography facilities to notify patients about the density of their breasts, so they can consult with their physicians about whether additional screening is needed.
Dense breasts can make cancers more difficult to detect. All of our Hopkins sites use only 3D mammography, which gives us much more information because it lets us see the layers of cells, one millimeter at a time.
Should you keep your old mammogram images?
A: Mammography works best when we can compare new images to older ones. We ask our patients to please bring any previous mammogram images to a new mammogram appointment at our facility. Comparing current mammogram images to prior images can be very helpful in assessing a change. Even if you had a mammogram 15 years ago and you don’t think it’s useful, it is.
Medically reviewed by Pouneh Razavi, M.D.
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