Medical Oncologist
CION Cancer Clinics
Age and colon cancer: how your risk changes over a lifetime | CION Cancer Clinics
Age is the strongest single risk factor for colon cancer. Risk rises steadily after fifty, and most people diagnosed are in their sixties or older. That does not make younger adults safe, and rates in people under fifty-five are rising. This page explains why age matters, how risk changes decade by decade, when screening usually starts and stops, and which symptoms need a doctor at any age. At CION Cancer Clinics in Hyderabad, our oncologists explain colon cancer in plain words and plan care around you and your family.
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Medically reviewed by Dr. Naresh GunduConsultant Medical Oncologist · MBBS, DNB (Internal Medicine), DM (Medical Oncology, AIIMS) · last reviewed October 2026, next review due October 2027
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The short answer
Does the risk of colon cancer really rise with age?
Yes. Age is the single strongest risk factor for colon cancer, and the risk climbs steadily after fifty. Most people diagnosed are in their sixties or older. But colon cancer is not only a disease of old age, and younger adults do get it.
Age is a risk, not a cause
Getting older does not cause colon cancer on its own. It simply gives the lining of the bowel more years in which small changes can build up. Most people who are diagnosed have no single cause anyone can point to. Age, family history, diet, weight and smoking shift the odds. None of them is anyone's fault, and none of them decides what happens to one person.
Why younger people still need to listen
Rates in adults under fifty-five have been rising in several countries, even though they remain far lower than in older people. Doctors in India see colon cancer in people in their thirties and forties often enough that age alone should never be the reason a symptom is dismissed. You can read more about why it is rising in younger Indians.
A low-risk age is not a no-risk age. Symptoms count at every age.What age does
Why does getting older raise the risk?
Nobody can stop the clock, but knowing why age matters explains why screening works.
Polyps need time
Most colon cancers start as a polyp, a small growth on the bowel lining. Turning from a harmless polyp into a cancer usually takes many years, often a decade or more, so older bowels have simply had more time.
This slow change is the window that screening uses to catch polyps early.Copying errors add up
The bowel lining renews itself constantly, and every new cell is a copy. Small copying mistakes collect over a lifetime, and the body's repair systems become a little less thorough with age.
Longer exposure to other risks
Decades of diet, weight, smoking and alcohol slowly add their small effect to the bowel. None of these explains one person's cancer, but together they tilt the odds over a long life.
Factors that add to age
- A parent, brother or sister with colon cancer
- Previous polyps
- Long-standing ulcerative colitis or Crohn's disease
Why India sees younger patients
India has far more young adults than older ones, so younger patients make up a larger share of the people diagnosed here. Bleeding in a young person is also often put down to piles, so younger patients tend to be diagnosed later. Age still raises the risk in India, exactly as it does elsewhere.
Not sure whether this applies to you?
Ask an oncologistAcross a lifetime
How does colon cancer risk change from decade to decade?
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Twenties and thirties
Colon cancer is uncommon at this age, so it is often not the first thing anyone suspects. That is exactly why symptoms in young adults get missed. Bleeding or a lasting change in your bowels still needs a doctor.
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The forties
Risk begins to rise. Guidelines in the United States now advise average-risk adults to start screening at forty-five. India has no national bowel screening programme, so the choice sits with you and your doctor.
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Fifty to seventy-five
This is when most colon cancers are found and when screening does the most good. The NHS in England invites people from fifty to seventy-four for home stool testing. A positive stool test leads to a colonoscopy. It does not diagnose cancer.
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After seventy-five
Risk stays high, but whether to keep screening becomes a personal decision. It depends on your health, earlier results and how you would cope with a colonoscopy. Symptoms at this age always need checking.
Commonly believed
Four things people say about age, and what is actually true
"I am only thirty-two, so the bleeding must be piles."
Piles are the commonest cause of bleeding at any age. But a doctor should still examine you, especially if the bleeding keeps coming back or your bowel habit has changed.
"Colon cancer is an old man's disease."
Women get colon cancer nearly as often as men, and it is found in adults of every age. Older age raises the risk. It does not protect anyone younger.
"My parents are too old for tests to be worth it."
A fit seventy-year-old may still gain a lot from screening. What matters is overall health, not the number alone, and that is a conversation for their doctor.
"I had one clear colonoscopy, so I am safe for life."
A clear colonoscopy is good news and usually means a long gap before the next one. It does not end your risk, because new polyps can grow as you get older.
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Symptoms do not wait for the right age
See a doctor within the week for bleeding from the bottom that keeps coming back, a change in bowel habit that lasts, unexplained weight loss or tiredness with a low haemoglobin. Go to an emergency department today for heavy bleeding, severe stomach pain with vomiting, or being unable to pass stool or wind.
Being straight with you
What this page cannot tell you
It cannot tell you your own risk. That depends on your age together with your family history, any past polyps, bowel conditions and your general health. A doctor who knows all of these can give a far better answer than any chart.
Who the age rules do not apply to
Screening ages are written for people at average risk with no symptoms. They do not apply if a parent, brother or sister had colon cancer, if your family has Lynch syndrome or polyposis, or if you have had ulcerative colitis or Crohn's disease for many years. These groups often start earlier. Read about screening with a family history if that is you.
Who can answer it
A CION oncologist can look at your history and suggest when screening should start or stop. If a colonoscopy is needed, CION arranges it with an accredited partner.
Unsure whether your age or family history puts you in a higher group? Call the helpline and ask.Questions we are asked
Common questions about age and colon cancer
At what age is colon cancer most common?
Most people are diagnosed in their sixties or later, and risk keeps rising with each decade after fifty. That does not make it rare in younger adults. A meaningful number of people are diagnosed in their thirties and forties, which is why symptoms deserve attention at any age.
Can you get colon cancer in your twenties?
Yes, though it is uncommon. When it happens at a young age, doctors often ask about family history and may suggest genetic counselling, because an inherited cause is more likely in young patients. Bleeding, lasting bowel changes or anaemia, meaning a low haemoglobin, still need checking.
Why is colon cancer rising in younger people?
Nobody knows for certain. Researchers are looking at diet, weight, physical activity, antibiotics and changes in gut bacteria, but no single cause has been proven. What is clear is that younger patients are often diagnosed later, because nobody suspected cancer at their age.
Should I start screening at forty-five or fifty?
Guidelines differ. American bodies start at forty-five for average-risk adults, while England invites people from fifty. India has no national programme. Talk to your doctor about your own history, and read our page on whether screening should start at forty-five or fifty.
Is there an age when screening should stop?
Most guidelines suggest regular screening up to about seventy-five, then a personal decision for the next ten years, and usually stopping after eighty-five. A healthy older person may continue. Someone frail may gain little. Your doctor will weigh this with you.
Does being older make colon cancer harder to treat?
Not by age alone. Treatment is planned on the stage of the cancer and on how fit the person is, not on the number of birthdays. Many older patients go through surgery and chemotherapy well. The tumour board weighs other illnesses and fitness, not age by itself.
My father was diagnosed at seventy. When should I start?
A parent with colon cancer raises your risk at any age, and screening often starts earlier than usual. How much earlier depends on his age at diagnosis and any other relatives affected. Take the details to your doctor, or read about family history and colon cancer.
Where can my parents get checked in Hyderabad?
Start with a consultation with a CION oncologist, who will look at their age, health and any symptoms. If a colonoscopy is needed, CION arranges it through an accredited partner. Call the helpline and someone will guide you to the nearest centre.
Your Specialists
Meet CION's colon cancer specialists. Bring your colonoscopy, scan or biopsy report.
Our surgical and medical oncologists plan colon cancer care together: which operation, whether chemotherapy is needed, and the follow-up that comes after.
Medical Oncologist
Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
Medical Oncologist
Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
Medical Oncologist
Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
Medical Oncologist
Medical Oncologist
Surgical Oncologist
Dr. Muralidhar Muddusetty
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
Surgical Oncologist
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Sources
- American Cancer Society — Colorectal Cancer Risk Factors
- American Cancer Society — Colorectal Cancer Guideline
- Cancer Research UK — Risks and causes of bowel cancer
- NHS — Bowel cancer screening
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
At what age should colon cancer screening start?The next question once you know age mattersColon cancer in young adultsIf you are under fifty and worriedRisk factors you cannot changeAge alongside family history, polyps and bowel diseaseWhen to stop colon cancer screeningFor older parents deciding whether to keep testing
Talk to us
Is it time for you or a parent to be checked?
Tell us your age, any symptoms and any family history. A CION oncologist will say plainly whether screening or a colonoscopy makes sense now, and arrange it through an accredited partner if it does. One helpline serves every CION centre.