Cancer is not rare. About 39.2% of men and women will be diagnosed with some form of cancer during their lifetime, based on the most recent U.S. data from 2021 to 2023. That means roughly two out of every five people will face a cancer diagnosis at some point. But how common cancer is depends heavily on your age, the specific type, and where in the world you live.
Your Risk Changes Dramatically With Age
Cancer is genuinely uncommon in young people and becomes increasingly likely as you get older. The numbers shift by orders of magnitude across a single lifespan.
In age groups under 20, fewer than 26 out of every 100,000 people develop cancer in a given year. By ages 45 to 49, that climbs to about 350 per 100,000. And in age groups 60 and older, the rate exceeds 1,000 per 100,000. To put that in perspective, a person over 60 is roughly 40 times more likely to be diagnosed in any given year than a teenager.
The 2022 U.S. data illustrates this starkly. That year, about 11,000 new cancer cases were diagnosed in children under 15. Among adults aged 40 to 64, the number was nearly 752,000. And people 65 and older accounted for over 1.2 million new diagnoses, more than half of all cases that year. The total across all ages: roughly 2.1 million new cancer diagnoses in a single year.
Some Cancer Types Are Very Common, Others Truly Rare
When people think of cancer, they’re usually thinking of the types that affect hundreds of thousands of people each year. The five most commonly diagnosed cancers in the U.S. for 2026 are projected to be prostate (333,830 new cases), breast (324,580), lung (229,410), colorectal (158,850), and melanoma (112,000). These cancers dominate the statistics and the public conversation.
But there are hundreds of other cancer types, and many of them are genuinely rare. The National Cancer Institute defines a rare cancer as one that occurs in fewer than 15 out of every 100,000 people per year. That threshold covers a long list of cancers most people have never heard of. Collectively, though, rare cancers aren’t as marginal as you might expect. Globally, rare cancers accounted for 26.7% of all new cancer cases in 2022, totaling about 5.3 million diagnoses. They also made up 30% of all cancer deaths, partly because they tend to be diagnosed later and have fewer established treatment options.
Cancer Rates Vary Widely Around the World
Where you live has a significant effect on how likely a cancer diagnosis is. Australia has the highest age-adjusted cancer incidence rate in the world at 462.5 per 100,000 people. Sierra Leone has the lowest at 35.9 per 100,000, more than twelve times lower.
That gap reflects a combination of factors. Countries with older populations, higher rates of screening, and more complete medical record systems naturally report more cancer. Australia’s high rate is partly a function of excellent detection (especially for skin cancers and prostate cancer) and a population with high sun exposure. Lower-income countries often have younger populations and less access to screening, so many cancers go undiagnosed and uncounted. This doesn’t necessarily mean cancer is absent in those countries. It often means it’s being missed.
Survival Has Improved Substantially
A cancer diagnosis is far from what it was a generation ago. For patients diagnosed in 2017, the five-year survival rate across all cancer types combined was 72.5%. That means nearly three out of four people diagnosed with cancer were alive five years later. Survival varies enormously by type, with some cancers (like thyroid or early-stage breast) having survival rates above 90%, while others (like pancreatic) remain much harder to treat. But the overall trend is clearly improving.
The global picture is moving in the opposite direction when it comes to sheer numbers, though. The World Health Organization projects over 35 million new cancer cases worldwide in 2050, a 77% increase from the roughly 20 million cases recorded in 2022. Aging populations and population growth are the primary drivers.
Childhood Cancer Is Genuinely Uncommon
For parents wondering about their children, cancer in kids is rare by any measure. Leukemia, the most common childhood cancer, occurs at a rate of 4.9 per 100,000 children per year. That falls well under the threshold for what’s formally classified as a rare cancer. Among children who do develop leukemia, the peak age is 1 to 4, which accounts for about 34% of all childhood leukemia cases.
The total number of cancer diagnoses in children under 15 across the entire United States in 2022 was about 11,000. For comparison, adults aged 65 to 74 alone had more than 665,000 new diagnoses that same year. Cancer in children, while devastating when it occurs, is statistically uncommon.
Putting It All Together
Cancer as a category is common. A 39% lifetime risk means it will touch most families at some point. But the likelihood of any individual developing cancer in a given year is low, especially before middle age. A healthy 30-year-old has a very different risk profile than a 70-year-old, and a diagnosis of breast cancer is a fundamentally different situation than a diagnosis of a rare sarcoma. The word “cancer” covers such an enormous range of diseases that asking whether cancer is rare is a bit like asking whether infections are rare. Some are everywhere, some are vanishingly uncommon, and your personal risk depends on specifics that a single statistic can’t capture.