Some studies have suggested that individuals with blood type O may be slightly more common among centenarians (people who live to 100 years or older). However, the evidence is mixed, and blood type alone does not determine how long someone will live.
Here’s what current research tells us.
Can Your Blood Type Influence Longevity?
Blood type is determined by inherited genes and falls into one of four main groups:
- Type A
- Type B
- Type AB
- Type O
Scientists have investigated whether these blood groups are associated with differences in the risk of certain diseases, including heart disease, blood clots, and some cancers. Because these conditions can affect life expectancy, researchers have wondered whether blood type might indirectly influence longevity.
The results have been interesting—but far from conclusive.
Why Blood Type O Gets Attention
Several studies have found that blood type O may be associated with a lower risk of blood clots and, in some populations, a slightly lower risk of coronary heart disease compared with non-O blood types.
One reason is that people with type O generally have lower levels of von Willebrand factor and factor VIII, two proteins involved in blood clotting. Lower levels may reduce the likelihood of developing dangerous blood clots.
Since cardiovascular disease remains one of the leading causes of death worldwide, researchers have suggested that this difference could contribute to a modest advantage in longevity.
However, this does not mean everyone with blood type O will live longer.
What About Other Blood Types?
Research has found that:
Blood Type A
Some studies have linked blood type A with a slightly higher risk of certain cardiovascular diseases and stomach cancer. However, many people with type A live long, healthy lives.
Blood Type B
Blood type B has been associated in some research with a lower risk of certain diseases but a higher risk of others. Findings vary between populations.
Blood Type AB
AB is the rarest blood type and has been linked in some studies to an increased risk of blood clots. Again, these associations are relatively small and do not predict an individual’s lifespan.
What Studies on Centenarians Show
Researchers studying people who live beyond 100 years have occasionally reported a higher proportion of blood type O among centenarians.
However:
- Other studies found no meaningful relationship.
- Genetics, environment, and lifestyle differ widely across populations.
- Blood type explains only a tiny fraction of the variation in lifespan.
In other words, blood type is one small piece of a much larger puzzle.
The Biggest Factors That Influence Longevity
Scientists consistently agree that the following have a much greater impact on lifespan than blood type:
Healthy Diet
A diet rich in fruits, vegetables, whole grains, legumes, nuts, and healthy fats supports heart and brain health.
Regular Physical Activity
Exercise helps maintain muscle strength, supports heart health, improves balance, and reduces the risk of many chronic diseases.
Not Smoking
Avoiding tobacco remains one of the most effective ways to increase life expectancy.
Maintaining a Healthy Weight
Excess body weight increases the risk of diabetes, heart disease, and several cancers.
Good Sleep
Adults should aim for about 7–9 hours of quality sleep each night.
Managing Stress
Long-term stress may contribute to high blood pressure, heart disease, and mental health challenges.
Preventive Healthcare
Regular medical checkups help detect health problems early, when treatment is often most effective.
Genetics Still Matter
Experts estimate that genetics account for roughly 20–30% of the variation in human lifespan, while lifestyle and environmental factors account for the majority.
Blood type is just one inherited characteristic among many and should not be viewed as a predictor of longevity.
Common Myths About Blood Type
Myth: Blood type determines your lifespan.
Reality: No blood type guarantees a long or short life.
Myth: Type O people cannot develop heart disease.
Reality: Anyone can develop heart disease, regardless of blood type.
Myth: Changing your diet based only on blood type improves health.
Reality: There is no strong scientific evidence supporting blood type diets for weight loss or disease prevention.
Tips for Living a Longer, Healthier Life
If your goal is healthy aging, focus on habits that have strong scientific support:
- Eat a balanced diet rich in whole foods.
- Stay physically active throughout life.
- Don’t smoke.
- Limit alcohol if you drink.
- Get enough sleep.
- Manage blood pressure, cholesterol, and blood sugar.
- Stay socially connected.
- Keep your mind active through learning and hobbies.
Final Thoughts
Some research suggests that people with blood type O may have a slightly lower risk of certain cardiovascular conditions, which could contribute to a modest advantage in longevity. However, the evidence is not strong enough to conclude that any blood type is destined to live to 100.
Reaching an exceptional age is influenced by a complex combination of genetics, lifestyle, healthcare, environment, and chance. Rather than focusing on your blood type, the most effective strategy is to adopt healthy daily habits that support long-term well-being.
Living to 100 is never guaranteed—but taking care of your health today can improve both the length and quality of your life, regardless of your blood type.