Risk of Cancer Increases with Age

Cancer risk increases exponentially with age, peaking in mean and women in their 80s. About 60% of cancers occur in people aged 65 and older.

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World Cancer Day

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In the elderly, cancer is one of the predominant causes of mortality and morbidity, and its incidence increases with aging. 60% of all cancer cases and 70% of cancer-related deaths occur in patients aged 65 years and over.

Why is cancer more prevalent in older adults and the elderly?

Scientists have known for years that age is a leading risk factor for the development of many types of cancer, but why aging increases cancer risk remains unclear.

Research and expert opinion suggest the prevailing reason is a prolonged build-up of cellular damage, called DNA methylation. The binding of chemical tags (called methyl groups) onto DNA affects interactions between DNA and the cell's ability to make proteins, making it easier to become a cancer cell. The longer we live, the more methylation we will have.

Other reasons are long-term exposure to carcinogenic (cancer-causing) agents, defects in genes that suppress tumor formation, broken cellular repair processes, oncogenic activation (normal cells undergo oncogene mutations that lead to the development of cancer), and lowered immunity.

The most common cancers in the elderly

(Note that these are not in any particular order.)

Colon cancer. More than 50% of colon cancer cases affect adults aged 67 and older. Thanks to prevention techniques, colon cancer is a less common diagnosis than other types of cancer and 63% of persons with colon cancer live 5 or more years after their diagnosis. Warning signs include changes in bowel habits such as more frequent diarrhea or constipation, bloody stool (which could be bright red or black), a feeling of fullness or a feeling of not being "done" after a bowel movement, persistent abdominal pain, aches or cramps, and unexpected weight loss.

Pancreatic cancer. Usually diagnosed in advanced stages, most cases affect adults aged 65 and older. Early warning signs include sudden-onset diabetes, jaundice (yellowing of the eyes and skin), itchy hands and feet, loss of appetite, loss of taste or smell, pale (clay-colored) or tarry (black, sticky) stool, and unexplained weight loss.

Change in Stool Color is a Good Indicator

Bladder cancer. More than 70% of all bladder cancer cases affect men between the ages of 50 and 80, with more than 50% of cases occurring in those 65 and older. Warning signs are frequent urination, burning with urination, bladder spasms, bloody urine, distended bladder, and pelvic pain.

Prostate cancer. More than 50% of all prostate cancer cases affect men aged 75 and older. Although early warning signs are rare, some men experience symptoms prior to diagnosis. These include frequent urination, difficulty starting or stopping urine flow, burning sensation during urination, intermittent or weak urine stream, and bloody urine or ejaculate.

Breast cancer. The incidence of breast cancer among women aged 65 and older is almost two times higher than among women between ages 45 and 64, and ten times higher than women younger than 45. Early warning signs include a lump in the breast or armpit, swelling in the breast, changes in breast skin, or changes in the nipple (such as inverting or discharge).

Lung cancer. More than 80% of all lung cancer cases affect adults age 60 and older, with more than 50% of cases occurring in those 70 and older. Warning signs include persistent coughing, chest pain, coughing up blood, difficulty breathing, and recurrent or chronic respiratory infections.

Can cancer risk be reduced?

Yes! Even in older age. Probably not surprisingly, the ways to reduce cancer risk are the same as those promoted to reduce the risk of any other chronic illness or condition... Make healthy choices.

If your loved one is over the age of 65 and has already been diagnosed with cancer, Cancer.net offers an excellent guide to navigating cancer care.

For more on cancer screenings, see our Guide Should Older Adults be Screened for Common Cancers?

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RESOURCES

American Cancer Society, Facts & Figures 2021

American Cancer Society, Cancer in the Oldest Old

DeSantis, C.E., Miller, K.D., Dale, W., Mohile, S.G., Cohen, H.J., Leach, C.R., Goding Sauer, A., Jemal, A., & Siegel, R.L. (2019). Cancer statistics for adults aged 85 years and older, 2019. CA: A Cancer Journal for Clinicians, 69(6), 452-467. DOI

CDC

Estape, T. (2018). Cancer in the elderly: Challenges and barriers. Asia Pacific Journal of Oncology Nursing, 5(1), 40-42. DOI

Moffitt Cancer Center

National Cancer Institute

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