After age 60, most major medical organizations recommend a screening mammogram every one to two years. The U.S. Preventive Services Task Force specifically recommends every other year (biennial screening) from age 40 through 74. Other organizations, like the American Cancer Society, say women 55 and older can choose between annual and biennial mammograms based on their preferences and risk factors.
What the Major Guidelines Recommend
The guidelines don’t all agree, which is part of why this question comes up so often. Here’s how the recommendations break down for women in their 60s and early 70s:
- U.S. Preventive Services Task Force (USPSTF): Every two years, through age 74.
- American Cancer Society (ACS): Every one or two years, as long as you’re in good health and expected to live at least 10 more years.
- American College of Radiology: Every year, with no upper age limit, unless serious health conditions limit life expectancy.
- American College of Obstetricians and Gynecologists: Every one or two years, continuing until at least age 75.
The practical takeaway: screening every two years is the most widely supported baseline. Screening every year is a reasonable choice if you prefer it, particularly if you have risk factors like a family history of breast cancer or dense breast tissue. The difference between these two schedules is real but modest for women over 60.
Annual vs. Every Two Years: How Much It Matters
For women aged 50 to 69, annual screening does catch slightly more cancers than biennial screening. Modeling studies estimate that annual mammograms prevent roughly 165 to 205 additional breast cancer deaths per 100,000 women compared to biennial screening. Annual screening also catches cancers between scheduled screens (called interval cancers) at a slightly lower rate: about 22% of breast cancer cases versus 27% with biennial screening.
But annual screening comes with a tradeoff. It roughly doubles your exposure to false positives over time, meaning more callbacks for additional imaging and the anxiety that comes with them. For women 50 to 69, a large systematic review concluded that annual screening “may have small additional benefits but an important increase in false positive results.” The review also noted that more frequent screening slightly increases cumulative radiation exposure over the years, though the absolute risk from this remains very small.
For women aged 70 to 74, the picture shifts further. Modeling studies found essentially no meaningful difference in breast cancer deaths averted between annual and biennial screening in this age group, with estimates ranging from 3 fewer to 10 more deaths prevented per 100,000 women. At this age, every-other-year screening captures nearly the same benefit with fewer downsides.
Screening After 74: When to Consider Stopping
This is where guidelines get less definitive, because no major clinical trials have ever enrolled women 75 or older. The USPSTF stops its recommendation at age 74, not because screening becomes harmful, but because there isn’t strong evidence to guide a recommendation beyond that point. A trial emulation study found no difference in breast cancer death rates when comparing women who continued screening from 75 to 84 with those who stopped.
Continuing screening between ages 70 and 74, however, does appear to help. One analysis found a 22% decrease in the risk of dying from breast cancer among women who kept screening through 74 compared to those who stopped at 70. So if you’re in your early 70s, the evidence supports continuing.
After 75, the key factor is your overall health and life expectancy. Every major organization uses a similar threshold: screening makes sense as long as you’re in reasonably good health and expected to live at least 10 more years. Breast cancer typically grows slowly, and screening is most valuable when there’s enough time ahead for early detection to change outcomes. If you have serious chronic conditions that significantly limit your life expectancy, the potential harms of screening, including unnecessary biopsies and treatment, begin to outweigh the benefits.
Overdiagnosis Becomes More Common With Age
Overdiagnosis means detecting a cancer that would never have caused symptoms or shortened your life. It’s not a false positive (where the mammogram flags something that turns out not to be cancer). Overdiagnosis means the cancer is real, but so slow-growing that it wouldn’t have become a problem. The issue is that once a cancer is found, it’s almost always treated, because there’s no reliable way to know in advance which cancers will progress and which won’t.
Among women aged 70 to 74 diagnosed with breast cancer through screening, an estimated 31% represent overdiagnosis. That number climbs to 47% for women aged 75 to 84, and exceeds 50% for women with a life expectancy under five years. This is the main reason guidelines become more cautious about routine screening in older age. The screening itself isn’t risky, but the cascade of treatment that follows a diagnosis (surgery, radiation, hormonal therapy) carries real physical and emotional costs, especially for cancers that would never have caused harm.
What Your Mammogram Report Now Includes
As of 2024, a federal rule requires every mammography facility to tell you whether you have dense or non-dense breast tissue. Dense breast tissue is common (about half of women have it) and matters for two reasons: it makes mammograms harder to read, and it’s an independent risk factor for breast cancer. If your report says you have dense breasts, you may want to discuss supplemental screening options like breast ultrasound or MRI with your doctor, and this information may factor into whether you lean toward annual rather than biennial mammograms.
Medicare Covers Annual Screening at No Cost
If you’re 65 or older and enrolled in Medicare Part B, screening mammograms are covered once every 12 months with no out-of-pocket cost, as long as your provider accepts Medicare assignment. This means that even though the USPSTF recommends every two years, Medicare gives you the option to screen annually at no charge. If you need a diagnostic mammogram (because of a lump, pain, or an abnormal screening result), Medicare covers those too, though you’ll pay 20% of the approved amount after meeting your Part B deductible.
Diagnostic vs. Screening Mammograms
Everything above applies to routine screening, meaning mammograms done when you have no symptoms. If you notice a new lump, skin changes on the breast, nipple discharge, or unexplained pain, that calls for a diagnostic mammogram regardless of when your last screening was. Diagnostic mammograms are done whenever medically necessary and aren’t limited to a yearly or biennial schedule. They involve more detailed imaging and are evaluated in real time, so you typically get results the same day.