Cancer Screening Guidelines by Age: A Plain Summary

Cancer screening means checking for cancer before you have any symptoms. Different cancers have different recommended starting ages, because each cancer behaves differently and each screening test has its own strengths and limits.

This article is a rough map, not a personal plan. Guidelines vary between expert groups and change over time, and your own age, health, and family history all matter. Use this as a starting point for a talk with your doctor.

These are general guidelines; your doctor tailors the plan to you.

Breast cancer screening usually means a mammogram, an X-ray of the breast that can find changes before they can be felt.

The organisations do not agree, so it is worth knowing whose rule you are being given. The US Preventive Services Task Force, in 2024, recommends screening every other year from age 40 through 74 for women at average risk, and grades that B. The American Cancer Society offers annual screening from 45, with the option to start at 40 and a move to every other year from 55. Both leave room for starting earlier if your risk is above average.

If you have a family history of breast cancer or other risk factors, your doctor may suggest starting earlier or adding other tests. This is a good area to discuss what fits your history.

For average-risk women, the USPSTF now recommends mammography every other year from age 40 to 74.

Cervical cancer screening looks for early changes in the cervix that could lead to cancer, using a Pap test, an HPV test, or both.

The schedule below is the US Preventive Services Task Force's, for people at average risk with a cervix. Screening begins at age 21. From 21 to 29, it recommends a Pap test every 3 years. From 30 to 65, there are three accepted options: a Pap test every 3 years, an HPV test every 5 years, or both together every 5 years. The HPV test can be collected by a clinician or, in many settings now, by you — self-collection is an option worth asking about if getting to an appointment is the hard part. Most people can stop at 65 after a history of normal results. Your own history may change this, so your doctor will confirm the schedule that applies to you.

Cervical screening runs from age 21 to age 65.

Colorectal cancer screening looks for cancer and for growths called polyps that could become cancer over time.

For adults at average risk, screening commonly begins around age 45 and continues into the mid-70s. After that, whether to keep screening is an individual decision based on health and past results.

There is more than one way to screen. Options include stool-based tests done at home and visual exams like colonoscopy. Because the choices differ in how often they are done and what they involve, ask your doctor which option fits you best.

Average-risk colorectal screening usually starts around age 45.

Lung cancer screening uses a low-dose CT scan, a special X-ray that makes detailed pictures of the lungs using a small amount of radiation.

It is not for everyone. The USPSTF recommends annual low-dose CT for adults aged 50 to 80 who have a 20 pack-year smoking history and who either still smoke or quit within the past 15 years. It says to stop once someone has not smoked for 15 years, or develops a health problem that would rule out treatment. Your doctor can help you figure out whether you qualify, based on your age and smoking history.

Lung screening is for certain older adults with a significant smoking history.

Prostate cancer screening is different from the others because it is not automatic. Instead of a set age when everyone starts, it is a personal decision.

Expert groups suggest that men aged 55 to 69 talk with their doctor about the benefits and harms of the PSA blood test and decide together. Some higher-risk men, such as Black men or those with a family history, may begin these conversations earlier. For most men 70 and older, routine screening is generally not recommended.

Prostate screening is a shared decision, not an automatic test at a set age.

You may notice that different groups suggest slightly different ages. That is normal. Experts review the same research but can weigh the benefits and harms a little differently, and guidelines update as new studies appear.

Your own situation matters just as much as the general rule. A strong family history, certain inherited gene changes, or a past cancer can change when to start and how often to screen. The best plan is the one you build with your doctor, using guidelines like these as a starting point.