Yes, anyone can have a stroke, at any age. While stroke is far more common in older adults, it occurs in young adults, children, and even newborns. About 800,000 Americans have a stroke each year, and roughly 1 in 4 of those happen in people under 65. No combination of youth, fitness, or healthy habits makes a person completely immune.
Age Is the Biggest Factor, but Not a Requirement
Stroke prevalence climbs sharply with age. Among U.S. adults 65 and older, about 7.7% have had a stroke. For those 18 to 44, that number drops to around 0.9%. The gap is enormous, but that 0.9% still represents hundreds of thousands of younger adults. And the trend is moving in the wrong direction: stroke prevalence among adults under 65 has increased by roughly 15% over the past decade, according to CDC surveillance data.
Men face higher stroke risk than women through most of adulthood. Between ages 45 and 49, men are about 1.7 times more likely to have a stroke than women of the same age. That gap narrows steadily, and by around age 80, the difference essentially disappears. After 80, women may actually face equal or slightly higher risk, partly because women tend to live longer and accumulate more years of exposure to risk factors like high blood pressure and irregular heart rhythms.
Race and ethnicity also shape risk. Hispanic and Latino Americans have higher rates of both ischemic stroke and brain hemorrhage compared to non-Hispanic white Americans, especially at younger ages. Black Americans face elevated stroke risk as well. These disparities reflect a combination of genetic factors, differences in access to preventive care, and higher rates of conditions like high blood pressure and diabetes in some communities.
Strokes in Children and Infants
Stroke in children is rare but real. The causes look different from adult strokes. Congenital heart disease is one of the leading risk factors, present in up to 30% of childhood stroke cases. Children born with certain heart defects face a roughly 16-fold increase in stroke risk compared to the general pediatric population. Single-ventricle heart defects carry some of the highest risk.
Sickle cell disease is another major cause of pediatric stroke. The abnormally shaped red blood cells can block blood flow to the brain. Other triggers include blood vessel abnormalities in the brain (arteriopathies), inherited clotting disorders, and rare conditions like moyamoya disease, where arteries at the base of the brain gradually narrow. Even cancer and its treatments can increase stroke risk in children. Newborns can have strokes during or shortly after birth, often linked to heart defects or clotting problems inherited from their parents.
Why Young, Healthy Adults Have Strokes
When someone under 45 has a stroke, the cause often surprises them. A large international study analyzing data from 32 countries found that the most powerful risk factors for ischemic stroke in young adults were cardiac conditions (increasing risk more than 8-fold), binge drinking (about 5-fold), and high blood pressure (about 5-fold). Smoking, abdominal obesity, abnormal cholesterol ratios, and chronic psychosocial stress were also significant contributors.
For hemorrhagic strokes (bleeding in the brain) in young adults, only two factors stood out: high blood pressure, which increased risk 9-fold, and binge drinking, which increased it 4-fold. The takeaway is that many young adult strokes are driven by the same conventional risk factors that affect older people. They just tend to go undiagnosed and untreated in younger populations because neither the patient nor their doctor is looking for them.
Some young adults have strokes with no obvious explanation. A small hole between the upper chambers of the heart, called a patent foramen ovale (PFO), is one suspected culprit. It’s present in roughly 1 in 4 people from birth and usually causes no problems, but it can allow a blood clot to cross from the veins into the brain’s blood supply. Tears in the arteries of the neck (arterial dissection), sometimes triggered by something as minor as a chiropractic adjustment or a roller coaster ride, are another cause specific to younger patients.
Strokes With No Known Cause
Conventional risk factors like high blood pressure, diabetes, high cholesterol, and smoking explain only 60% to 80% of all strokes. That leaves a meaningful percentage that occur for reasons that aren’t immediately obvious. Doctors call these “cryptogenic” strokes, and they account for a substantial share of cases, particularly in younger patients.
In many cryptogenic strokes, the likely mechanism is a blood clot that traveled to the brain from somewhere else in the body, but the original source can’t be identified even after thorough testing. Brain imaging in these patients often shows a pattern of damage near the brain’s surface consistent with a clot that arrived from elsewhere. About 65% of strokes initially classified as “undetermined cause” eventually show evidence of a likely clot source on further evaluation, such as undetected irregular heart rhythms, small plaques in the aorta, or structural heart abnormalities.
This is why some people who seem perfectly healthy, with normal blood pressure, no diabetes, and no smoking history, still have strokes. A hidden heart rhythm problem that occurs only intermittently, or a blood vessel abnormality that doesn’t show up on routine screening, can be enough.
Silent Strokes You Might Not Notice
Not every stroke announces itself with sudden symptoms. Silent strokes cause small areas of damage in the brain that show up on imaging but never produced noticeable symptoms at the time they occurred. In the Framingham Offspring Study, about 10.7% of participants had evidence of at least one silent stroke on brain MRI. Other studies have found rates between 11% and 28%, depending on the age of the group studied.
Silent strokes aren’t harmless just because you didn’t feel them happen. Over time, they accumulate and contribute to cognitive decline, memory problems, and an increased risk of a larger, symptomatic stroke in the future. They’re most commonly found in people with high blood pressure, but they can occur in people who seem otherwise healthy.
Genetic Conditions That Cause Stroke
Some people carry inherited conditions that predispose them to stroke regardless of how well they manage their lifestyle. These are rare, but they’re an important reason why stroke can strike people who appear to have done everything right.
CADASIL is one of the most well-known inherited stroke disorders. It damages the small blood vessels in the brain, leading to repeated small strokes that typically begin in a person’s 30s or 40s. Fabry disease, sickle cell anemia, Ehlers-Danlos syndrome (which weakens blood vessel walls), and Marfan syndrome all carry elevated stroke risk. Moyamoya disease causes progressive narrowing of brain arteries and can affect both children and adults. MELAS, a mitochondrial disorder, causes stroke-like episodes alongside other neurological symptoms.
For many of these conditions, no cure exists. Treatment focuses on managing symptoms, controlling blood pressure, and in some cases using blood thinners to reduce clot risk.
Less Obvious Risk Factors
Beyond the well-known culprits, several less recognized factors contribute to stroke risk. Sleep apnea, a condition where breathing repeatedly stops during sleep, is increasingly linked to stroke. It’s common in adults and often undiagnosed for years. Chronic insomnia and other sleep disturbances also appear to raise risk.
Air pollution is another contributor that operates at a population level. While it may matter less for any single individual than high blood pressure does, its effects are widespread. People living in areas with heavy air pollution face a measurably higher stroke burden, particularly in low- and middle-income countries.
Chronic stress and depression are genuine biological risk factors, not just lifestyle complaints. The international INTERSTROKE study found that psychosocial stress more than doubled the risk of ischemic stroke in young adults. Stress raises blood pressure, promotes inflammation, and makes people more likely to smoke, drink heavily, and eat poorly.
How Many Strokes Are Preventable
A large portion of strokes could be avoided through lifestyle changes alone. Research tracking tens of thousands of men and women found that roughly half of ischemic strokes in both sexes were attributable to not following a low-risk lifestyle. Specifically, about 54% of ischemic strokes in women and 52% in men could potentially have been prevented if those individuals had maintained healthy habits across five key areas: not smoking, moderate alcohol use, healthy body weight, regular physical activity, and a balanced diet.
For total strokes (including hemorrhagic), the numbers were 47% for women and 35% for men. The difference between ischemic and total stroke reflects the fact that hemorrhagic strokes are sometimes driven by factors like blood vessel malformations that lifestyle changes can’t fix.
Recognizing a Stroke Quickly
Knowing that strokes can happen to anyone makes recognition critical. The most widely used tool is the BE FAST acronym: Balance (sudden loss of balance or coordination), Eyes (sudden vision changes in one or both eyes), Face (one side of the face drooping), Arm (weakness or numbness in one arm), Speech (slurred or strange speech), and Time (call emergency services immediately). The original FAST version omits the balance and eye symptoms, which together account for a meaningful number of strokes that people might otherwise dismiss as something less serious.
Speed matters because treatments for ischemic stroke work best within a narrow time window. Every minute of delay means more brain tissue lost. This is true whether the person having the stroke is 80 years old or 30.