The recommended age to start routine mammograms is 40. The U.S. Preventive Services Task Force (USPSTF) recommends screening mammograms every two years for women aged 40 to 74. This was updated in 2024, lowering the starting age from the previous recommendation of 50. If you have certain risk factors, screening may start even earlier.
Current Age Guidelines at a Glance
The two most influential sets of guidelines in the U.S. agree that 40 is the right age to begin, but they differ on how often you should go.
The USPSTF recommends a mammogram every two years (biennial) from age 40 through 74. This is the guideline that determines insurance coverage under the Affordable Care Act, meaning most private insurers must cover biennial screening mammograms starting at 40 with no co-pay.
The American Cancer Society takes a slightly different approach, breaking it into age brackets:
- Ages 40 to 44: You have the option to start yearly mammograms, but it’s not a strong recommendation.
- Ages 45 to 54: Yearly mammograms are recommended.
- Ages 55 and older: You can switch to every other year, or continue going annually if you prefer.
The practical takeaway: if you’re 40 or older, it’s time to start screening. Whether you go every year or every two years depends on which guideline your provider follows and your personal preferences.
When Screening Should Start Before 40
Some women need to begin screening well before 40. If you carry an inherited change in the BRCA1 or BRCA2 genes, professional groups generally recommend starting breast cancer screening at a younger age, often in your mid-20s to early 30s. Screening for high-risk individuals typically includes MRI in addition to mammography, because mammograms alone are less effective at catching cancer in younger, denser breast tissue.
You may also qualify for earlier or more intensive screening if you have a first-degree relative (mother, sister, daughter) who was diagnosed with breast cancer, especially before menopause, or if you received radiation therapy to the chest area between the ages of 10 and 30. A healthcare provider can perform a formal risk assessment to determine whether you fall into the high-risk category and should start screening before 40.
When to Stop Getting Mammograms
This is less clear-cut than the starting age. The USPSTF says there isn’t enough evidence to recommend for or against screening after age 75. No major clinical trials have ever enrolled women 75 or older, and a simulated trial analysis showed no clear benefit to screening women in the 75 to 84 age range.
That doesn’t mean you should automatically stop at 75. The decision typically comes down to your overall health and life expectancy. A healthy 78-year-old with no major chronic conditions is in a very different situation than someone the same age managing several serious illnesses. Your provider can help weigh whether the potential benefit of catching a cancer early still outweighs the downsides of screening, which include false positives and unnecessary biopsies.
Screening vs. Diagnostic Mammograms
Everything above applies to screening mammograms, the routine ones you get when you have no symptoms. Diagnostic mammograms are a different category entirely, and age guidelines don’t apply to them in the same way.
If you notice a lump, unusual pain, skin changes, or nipple discharge at any age, your doctor can order a diagnostic mammogram to investigate. These are targeted exams designed to evaluate a specific concern, not general screening. A 30-year-old with a new breast lump would typically get imaging, regardless of whether she’s reached the recommended screening age. A diagnostic mammogram usually requires a doctor’s order, while screening mammograms generally do not.
What About Dense Breasts?
About half of women who get mammograms have dense breast tissue, which can make cancers harder to spot on a standard mammogram. You’ll find out your breast density from your mammogram results, as most states now require facilities to notify you.
Dense breasts are a mild independent risk factor for breast cancer, and it’s natural to wonder if you need additional testing like an ultrasound or MRI on top of your regular mammogram. The American College of Obstetricians and Gynecologists does not recommend routine supplemental screening for women with dense breasts who have no other risk factors. The published evidence so far hasn’t shown that adding ultrasound or MRI to standard mammography meaningfully reduces breast cancer deaths in this group. If you have dense breasts plus other risk factors, like a strong family history, the calculus changes, and supplemental screening is more likely to be worthwhile.
Insurance Coverage for Mammograms
Because the USPSTF now gives mammography starting at age 40 a “B” recommendation, the Affordable Care Act requires most private health plans to cover biennial screening mammograms from age 40 to 74 at no out-of-pocket cost. You should not owe a co-pay, deductible, or coinsurance for a covered screening mammogram.
Medicare covers an annual screening mammogram for all enrollees aged 40 and older. If you’re between 35 and 39, Medicare covers a single baseline mammogram as well. Keep in mind that if a screening mammogram turns into a diagnostic one during your visit (the radiologist spots something and wants additional images right away), billing can shift, and you may face different cost-sharing. It’s worth asking the facility beforehand how they handle this situation.