Why some screenings have stop ages, since they take a decade to pay off

Key takeaways

• In trials pooled by University of California, San Francisco researchers, it took about 10 years of breast or colorectal screening to prevent 1 cancer death per 1,000 people screened¹.
• The U.S. Preventive Services Task Force makes colorectal screening selective at 76 to 85, advises against Pap and HPV tests after 65 for women with enough normal past results and advises against PSA tests at 70 and older²³⁶.
• Stopping is earned, not automatic: most invasive cervical cancers in women over 65 occur in women who never met the stopping criteria³.
• In national survey data from 2000 to 2010, 55% of older men with at least a 75% chance of dying within nine years had still had a recent PSA test¹³.
• In a national survey published in 2018, older adults preferred hearing “your other health issues should take priority” to any talk of life expectancy, yet fewer than 1 in 10 said a doctor had recommended stopping a screening¹⁴.

From 2000 to 2010, a federal health survey asked 27,404 Americans 65 and older about their recent cancer screenings. Researchers at the University of North Carolina matched each answer to a validated index that estimates the chance of dying within nine years¹³.

In the sickest group, people with at least a 75% chance of dying in that time, 31% to 55% had recently been screened for cancer, depending on the test. For PSA tests in men, the share was 55%¹³.

Among women who’d had a hysterectomy for a noncancer reason, 34% to 56% had a Pap test in the past three years¹³.

These people weren’t careless. But a screening test is built for someone who will live long enough to collect its benefit. This guide covers what to start, what to keep and when stopping is the wiser choice.

Screening is a long bet, and the payoff comes late

In 2013, Sei Lee, Louise Walter and colleagues at UCSF pooled survival data from five breast screening trials and four colorectal screening trials in people over 50¹. The trials, run in the United States, Sweden, the United Kingdom and Denmark, followed people for 8 to 20 years¹.

It took about 10.3 years of colorectal screening to prevent 1 colorectal cancer death for every 1,000 people screened. For mammograms, it took about 10.7 years¹.

Early gains were tiny. Five years in, screening had prevented about 2.8 colorectal cancer deaths and 5.1 breast cancer deaths per 10,000 people. By 15 years, those totals had grown to about 23 and 19¹.

The harms show up right away. About 1 in 10 people screened for either cancer gets a false-positive result, an abnormal-looking test with no cancer behind it¹.

Colonoscopy can cause bleeding or a tear in the bowel, and the Task Force says both become more likely with age². In its review, screening colonoscopy led to about 15 major bleeds and 3 tears per 10,000 procedures².

The UCSF team concluded that people likely to live more than 10 years should be encouraged to get breast and colorectal screening. People with 3 to 5 years ahead probably should be discouraged¹. The authors also warned that their numbers shouldn’t be used to deny screening to anyone¹. Everyone in between faces a judgment call.

Your screening calendar, decade by decade

Your 20s and 30s. Pap tests start at 21³. Blood pressure checks start at 18 and can come every 3 to 5 years if your readings are normal and your risk is low¹⁰. Sexually active women 24 and younger should be tested for chlamydia and gonorrhea⁹. The Task Force advises an HIV test from 15 to 65 and a hepatitis C test from 18 to 79⁹. At 30, women can switch to an HPV test every five years³.

Your 40s. Mammograms every two years start at 40⁴. Blood pressure checks become yearly¹⁰. From 35 to 70, adults with overweight or obesity should be tested for prediabetes and diabetes⁹.

45 to 50. Colorectal screening starts at 45².

Your 50s through 70s. Long-time smokers become eligible for a yearly low-dose lung CT scan at 50⁵. From 55 to 69, a PSA test is a personal decision for men⁶. Women should get a bone density test at 65, or sooner after menopause if their fracture risk is higher⁸. Men 65 to 75 who have ever smoked should get one ultrasound to check for an abdominal aortic aneurysm, a bulge in the body’s main artery⁷.

The Task Force found that 305 men must be screened to prevent one aneurysm death⁷. By our arithmetic, that’s about 3 deaths prevented per 1,000 men, from a single scan.

Our preventive care checklist lists every top-graded service by age. This article focuses on when each test stops.

The screening start-and-stop chart

This chart is our own summary of Task Force guidance as of October 2026, with American Cancer Society (ACS) differences noted. “Not set” means the guidance gives no interval, so ask your clinician.

Test	Start	How often	Stop, or decide one by one
Pap or HPV test	21; ACS says 25312	Pap every 3 years at 21 to 29; at 30 to 65, Pap every 3 years, or HPV test alone or with a Pap every 53	After 65, if past results were normal and you aren’t at high risk3
Blood pressure	189	Yearly at 40+; every 3 to 5 years at 18 to 39 if normal10	No stop age9
Mammogram	404	Every 2 years4	Through 74; at 75+, evidence is insufficient; ACS says continue while healthy with 10+ years ahead412
Colorectal	452	Stool test yearly, colonoscopy every 10 years or other options2	Through 75; selective at 76 to 85; stop after 852
Lung CT	50, with 20 pack-years of smoking5	Yearly5	At 80, 15 years after quitting or with a health problem that rules out surgery; ACS sets no quitting cutoff512
PSA	55, as a personal choice; ACS says discuss at 50, or 45 for higher risk612	Not set	Not advised at 70+6
Aortic aneurysm ultrasound	Men 65 to 75 who ever smoked7	Once7	Done after one test7
Bone density	Women at 65, or younger after menopause if at higher risk8	Not set8	No stop age set8
Diabetes test	35, with overweight or obesity9	Not set here	The list ends at 709
Hepatitis C	189	Not set here	The list ends at 799

A pack-year is a pack a day for a year, so 20 pack-years could be a pack a day for 20 years.

Why each stopping rule exists

Colorectal: the 76-to-85 gray zone. At these ages, the Task Force judges the overall gain from screening everyone to be small. It asks you and your clinician to weigh your health, your screening record and your wishes². Adults never screened are more likely to benefit. After 85, the panel says other causes of death likely cancel out any survival gain².

Mammograms: no trials past 74. None of the randomized trials of mammography included women 75 or older⁴. The Task Force’s models found a small gain from screening until 79 instead of 74: 0.8 more breast cancer deaths averted⁴.

A study that used Medicare claims on more than 1 million women to mimic a trial found no difference in breast cancer deaths with screening continued at 75 to 79 or 80 to 84⁴. When public comments asked for a stop age tied to life expectancy, the Task Force pointed back to the missing trials in women 75 and older⁴. The ACS says to continue while a woman is in good health and expected to live at least 10 more years¹².

Pap and HPV tests: stopping is earned. The Task Force defines adequate past screening as three normal Pap tests in a row, or two normal combined Pap and HPV tests, in the 10 years before stopping, with the latest within five years³. No screening trials enrolled women over 65³. Most invasive cervical cancers in older women occur in women who hadn’t met those criteria³.

Lung CT: the 15-year rule. The Task Force says to stop after 15 years without smoking, or if a health problem sharply limits life expectancy or rules out lung surgery that could cure a cancer⁵. The ACS sets no years-since-quitting cutoff¹², so ask which rule your clinician follows.

PSA: the harms climb with age. Trial evidence shows no drop in prostate cancer deaths from screening men 70 and older⁶. In the first round of a large European trial, 20.6% of men over 70 had a false-positive result, compared with 3.5% of men under 55⁶.

Older men also have more complications from biopsies and surgery, and overdiagnosis, finding a cancer that never would have caused harm, is expected to peak at 70 and older⁶.

Bone density and blood pressure: no end date. Blood pressure screening has no upper age⁹. The osteoporosis guidance sets no stop age, and the Task Force lists the best stop age as an open research question⁸.

Two updates are in the pipeline. As of October 2026, the Task Force lists its cervical update as being finalized and its prostate update as a draft still in development¹¹. Until they’re final, the older advice stands.

The ACS already lists a self-collected vaginal sample, tested for HPV every three years, as one option¹². The panel’s own membership has also changed; our preventive care checklist article covers what that may mean.

Higher risk can move the start and the stop

A close relative’s diagnosis can move some screenings years earlier. Our article on family health history covers those rules.

Some histories also cancel a stop date. The cervical stopping rule doesn’t apply to women with a past high-grade precancer or cervical cancer, exposure to the drug DES before birth, or a weakened immune system, such as from HIV³. Guidelines cited by the Task Force advise screening for at least 20 years after treatment for a high-grade precancer, even past 65³.

Race and ethnicity show up in the guidance as well:

• Lung. When the Task Force widened lung CT eligibility in 2021, the number of Black adults who qualified rose 107%, compared with 78% for White adults⁵. Black people who smoke have a higher lung cancer risk than White people who smoke, especially at lighter smoking levels⁵.
• Prostate. Black men are more than twice as likely as White men to die of prostate cancer⁶. The Task Force made no separate recommendation, noting models but no direct proof that starting before 55 helps⁶. The ACS advises starting the PSA conversation at 45¹². The Task Force’s advice against screening at 70 and older still applies⁶.
• Breast and colorectal. Black women’s breast cancer death rate is about 40% higher than White women’s⁴, and Black adults have the highest rates of colorectal cancer and of death from it². The start ages stay the same, at 40 and 45²⁴.

How long does a test have to work for you?

UCSF’s free ePrognosis website collects tools that estimate how much time a person likely has, which is the window a screening test needs¹⁵.

One of them, the Lee Schonberg index, is for adults 50 and older living in the community. It asks 15 questions: age, sex, weight, how you rate your own health, conditions such as heart failure and diabetes, smoking and hospital stays¹⁵.

Several questions are about daily function: walking a quarter mile, managing money, bathing without help and pushing or pulling large objects¹⁵.

The tool turns the answers into a chance of death within 4 to 14 years, using national survey data from thousands of older adults¹⁵. Depending on the version and time span, it ranks who died and who lived correctly 72% to 82% of the time¹⁵. A coin flip would get 50%.

The site says its estimates are meant to support, not replace, your relationship with your clinicians¹⁵. A low 10-year risk suggests a test has time to pay off; a high one is a reason to talk.

Notice what drives the numbers. Walking, bathing and staying independent are exactly what movement, good food, sleep and community protect. A natural-health routine doesn’t just lower disease risk; it lengthens the window in which screening can help you.

How to talk about stopping, and what older adults want to hear

In a national survey published in 2018, researchers led by Nancy Schoenborn asked 881 adults 65 and older to rate 13 ways a clinician might explain stopping breast, prostate or colorectal screening¹⁴.

The favorite: “your other health issues should take priority.” The least favorite was no explanation at all¹⁴. Phrases about life expectancy ranked low. References to guidelines, older age, little benefit and real risk of harm ranked higher¹⁴.

Only 9.7% of respondents said a doctor had ever recommended stopping a screening¹⁴. So you may need to raise it yourself.

Stopping a test can feel like giving up. It isn’t. It matches an instinct many natural-health readers already have: skip the intervention that can’t help you, and keep the ones that still do.

Questions to ask before stopping a screening

This is our own list, built from the guidance above.

1. Was my past screening normal and complete enough to stop? For Pap tests, can we confirm my last 10 years of results³?
2. If I keep going, about how many years would this test need to help me¹?
3. What are the harms of this test at my age, such as bleeding, false alarms or overdiagnosis²⁶?
4. Was I ever fully screened for this cancer? People never screened may gain more².
5. Does my family history, race, smoking history or immune health change the answer³⁵⁶?
6. Which guideline are you following, and do other groups disagree¹²?
7. Which tests have no stop age that I should keep, such as blood pressure checks⁹?

What the evidence says about stopping

Claim	Evidence rating	What it rests on
Breast and colorectal screening prevent deaths, but the benefit builds over about 10 years	Strong evidence	Pooled survival data from nine trials1
Colorectal screening at 76 to 85 helps adults never screened before	Promising but early	Task Force says they’re more likely to benefit; the net gain for everyone in this age group is small2
Mammograms help women 75 and older	Not enough evidence	No trials; a Medicare-based study found no difference in deaths4
Pap or HPV tests help women over 65 with enough normal past results	Evidence says no, or unsafe	Task Force grade D: it recommends against these tests for this group3
PSA tests help men 70 and older	Evidence says no, or unsafe	Trials show no benefit; more false positives and harms6
Lung CT helps people more than 15 years smoke-free	Not enough evidence	The Task Force and the ACS disagree512
A life-expectancy tool can guide screening choices	Promising but early	Predicts death fairly well; meant to support a clinician’s judgment15

Questions readers ask

The bottom line

Screening is a long bet. For breast and colorectal cancer, the benefit takes about a decade to build, while false alarms and procedure risks arrive right away. That’s why guidelines set start ages, rhythms and stop points, and why stopping has rules of its own.

Keep the tests that fit your age and health, ask before you drop any of them and make sure you’ve earned the stop. A clear conversation about what a test can still do for you is good prevention too.

Related reading

• Your preventive care checklist survived the Supreme Court, but its authors are changing
• Screening finds cancer early, and it also finds cancer that never mattered
• A relative’s diagnosis can move your screening up by a decade
• How medical decisions are supposed to get made with you
• When extra medical tests do more harm than good

Sources

1. ScienceDaily, from BMJ and the University of California, San Francisco, reporting Lee SJ, Boscardin WJ, Stijacic-Cenzer I, Conell-Price J, O’Brien S, Walter LC. “Time lag to benefit after screening for breast and colorectal cancer: meta-analysis of survival data from the United States, Sweden, United Kingdom, and Denmark.” BMJ, 2013;346:e8441. Release dated January 9, 2013. sciencedaily.com
2. U.S. Preventive Services Task Force. “Colorectal Cancer: Screening.” Final recommendation statement, May 18, 2021. uspreventiveservicestaskforce.org
3. U.S. Preventive Services Task Force. “Cervical Cancer: Screening.” Final recommendation statement, August 21, 2018. uspreventiveservicestaskforce.org
4. U.S. Preventive Services Task Force. “Breast Cancer: Screening.” Final recommendation statement, April 30, 2024. uspreventiveservicestaskforce.org
5. U.S. Preventive Services Task Force. “Lung Cancer: Screening.” Final recommendation statement, March 9, 2021. uspreventiveservicestaskforce.org
6. U.S. Preventive Services Task Force. “Prostate Cancer: Screening.” Final recommendation statement, May 8, 2018 (update in progress). uspreventiveservicestaskforce.org
7. U.S. Preventive Services Task Force. “Abdominal Aortic Aneurysm: Screening.” Final recommendation statement, December 10, 2019. uspreventiveservicestaskforce.org
8. U.S. Preventive Services Task Force. “Osteoporosis to Prevent Fractures: Screening.” Final recommendation statement, January 14, 2025. uspreventiveservicestaskforce.org
9. U.S. Preventive Services Task Force. “A & B Recommendations.” USPSTF, accessed October 2026. uspreventiveservicestaskforce.org
10. U.S. Preventive Services Task Force. “Hypertension in Adults: Screening.” Final recommendation statement, April 27, 2021. uspreventiveservicestaskforce.org
11. U.S. Preventive Services Task Force. “Recommendations in Progress.” USPSTF, accessed October 2026. uspreventiveservicestaskforce.org
12. American Cancer Society. “American Cancer Society Guidelines for the Early Detection of Cancer.” ACS, last updated May 27, 2026. cancer.org
13. The ASCO Post. “Overscreening for Prostate, Breast, Colorectal, and Cervical Cancer Can Raise Costs and Harm Patients,” reporting Royce TJ, et al., JAMA Internal Medicine, 2014. October 15, 2014. ascopost.com
14. Schoenborn NL, Janssen EM, Boyd CM, Bridges JFP, Wolff AC, Pollack CE. “Preferred Clinician Communication About Stopping Cancer Screening Among Older US Adults: Results From a National Survey.” JAMA Oncology, 2018;4(8):1126–1128. pmc.ncbi.nlm.nih.gov
15. University of California, San Francisco. “Lee Schonberg Index.” ePrognosis, accessed October 2026. eprognosis.ucsf.edu