Study Explores the Link Between Blood Type and Longevity

What if something as simple as your blood type could offer clues about how you age?

Scientists have been exploring this question for decades. Blood type is best known for its importance in blood transfusions, but researchers have also discovered that the biological differences associated with the ABO blood group system may be connected to several aspects of health.

These findings have sparked interest in a possible relationship between blood type and longevity.

However, the science is more complicated than headlines sometimes suggest. Some studies have reported differences in survival or the frequency of certain blood types among exceptionally old people. Other research has found no meaningful relationship between blood group and lifespan. A recent study of older adults, for example, found no significant difference in ABO or Rh blood-group distribution between people aged 85 and older and a younger comparison group.

So, does blood type determine how long you will live?

The short answer is no. Current evidence does not support using blood type as a reliable predictor of an individual’s lifespan. Nevertheless, researchers believe blood-group differences may influence certain biological processes that are relevant to healthy aging.

Understanding that distinction is important.

What Is Blood Type?

The ABO blood group system divides blood into four major types:

• Type A
• Type B
• Type AB
• Type O

Your blood type is inherited from your parents and is determined by variations in genes that control certain molecules, known as antigens, on the surface of red blood cells.

The positive or negative sign sometimes attached to a blood type refers to the Rh blood group system. This produces familiar descriptions such as A-positive, O-negative, B-positive, and AB-negative.

Blood type plays an essential role in medical care, particularly when someone needs a blood transfusion. But ABO blood-group molecules are also found in other tissues and are involved in biological processes beyond transfusion compatibility.

That is one reason scientists have become interested in whether blood type might be connected to diseases that influence survival and aging.

Why Are Researchers Studying Blood Type and Longevity?

Longevity is influenced by an enormous number of factors.

Genetics, lifestyle, environment, medical care, socioeconomic conditions, infections, chronic diseases, and random biological variation can all affect how long a person lives.

Researchers have found that blood groups are associated with differences in some disease risks. For example, non-O blood groups have generally been associated with higher levels of certain clotting-related proteins than blood group O.

This may influence the likelihood of some blood-clotting conditions.

Blood groups have also been studied in connection with cardiovascular disease, certain cancers, inflammation, and other health conditions.

Because these diseases can affect survival, scientists have wondered whether blood type might indirectly influence longevity.

The key word is indirectly.

Having a particular blood type does not mean that a person will automatically develop a particular disease or live to a particular age. Instead, blood type may be one small factor that modifies the risk of certain conditions.

The Four Main Blood Types and Longevity

When researchers investigate the connection between blood type and lifespan, they generally compare the four major ABO groups.

Type O

Type O has received considerable attention because people with this blood group tend to have lower levels of some clotting-related proteins.

Research has associated type O with a lower risk of certain thrombotic conditions compared with non-O blood groups.

That might appear to suggest an advantage for longevity, especially because cardiovascular and clotting disorders can be serious.

However, the story is not that simple.

For example, people with type O blood can have a higher risk of serious bleeding in certain situations. Research in specific medical settings has also found that type O is not universally associated with better outcomes.

This illustrates an important point: a biological characteristic can reduce one risk while increasing another.

Therefore, type O should not be described as a guaranteed “longevity blood type.”

Type A

Type A has also been studied extensively.

Some research has identified associations between type A and cardiovascular disease, cholesterol-related characteristics, and certain cancers.

These associations have encouraged scientists to investigate whether type A could influence aging or lifespan.

But again, an association with a disease does not mean that everyone with type A blood will develop that disease.

Many other factors have much stronger effects on health outcomes.

Type B

Type B has produced some particularly interesting findings.

One earlier study involving people who had reached the age of 100 found that type B occurred more frequently among centenarians than in a comparison population. This led researchers to investigate whether type B might somehow be associated with exceptional longevity.

However, subsequent research did not consistently reproduce this finding.

A separate analysis found that the proportion of people with type B blood declined with increasing age, suggesting a very different relationship.

These conflicting findings demonstrate why scientists are cautious about claiming that type B blood increases lifespan.

Type AB

Type AB is the least common of the four major ABO blood groups in many populations.

Because it is less common, researchers sometimes have fewer participants available for statistical analysis.

Some studies have reported associations between type AB and cardiovascular or other health outcomes. However, there is not enough evidence to conclude that type AB is either beneficial or harmful for overall longevity.

What Does Recent Research Suggest?

A 2025 study examining ABO and Rh blood groups in people aged 85 and older found no significant differences in blood-group distribution between the older participants and a younger comparison group.

The researchers concluded that ABO and Rh blood-group diversity did not appear to be a major determinant of longevity in their study population.

This finding is important because it adds to a growing body of research suggesting that blood type alone is unlikely to explain why some people live into their 80s, 90s, or beyond.

Other studies have produced different results, however.

The overall picture is therefore mixed.

Rather than viewing blood type as a direct cause of longer or shorter life, scientists are increasingly interested in how blood-group biology interacts with other health factors.

How Could Blood Type Affect Health?

One possible explanation involves blood clotting.

People with non-O blood types tend to have higher concentrations of certain proteins involved in coagulation, including von Willebrand factor and factor VIII.

These proteins play important roles in blood clot formation.

Higher levels can contribute to differences in the risk of venous thromboembolism and some cardiovascular events.

Blood type has also been associated with differences in cholesterol, inflammation-related markers, blood-cell characteristics, and other biological traits.

Researchers are investigating whether these differences could influence the development of age-related diseases.

However, these relationships are complex.

A difference in one biological pathway does not necessarily translate into a measurable difference in overall life expectancy.

Blood Type and Heart Health

The potential connection between blood type and cardiovascular health is one of the most studied areas.

Research has found that people with non-O blood groups may have a higher risk of certain cardiovascular and clotting-related conditions compared with people with type O.

This does not mean that blood type is more important than traditional cardiovascular risk factors.

In fact, factors such as high blood pressure, smoking, diabetes, high cholesterol, physical inactivity, obesity, and family history can have substantial effects on cardiovascular health.

For someone trying to reduce their risk of heart disease, controlling blood pressure and cholesterol, avoiding tobacco, exercising regularly, and following a balanced diet are far more actionable than worrying about their ABO blood type.

Could Blood Type Affect the Aging Process?

Aging is not a single biological process.

As people grow older, multiple systems change simultaneously. The immune system changes, blood vessels become less flexible, metabolism can change, and the body’s ability to repair cellular damage may decline.

Researchers are interested in whether blood-group differences influence any of these processes.

There are several possible mechanisms under investigation, including:

• Blood clotting
• Inflammation
• Blood-vessel function
• Immune responses
• Metabolism
• Cholesterol regulation
• Interactions between cells and their surrounding environment

These mechanisms could potentially affect the development of diseases associated with aging.

But potential biological mechanisms are not the same as proof that blood type determines lifespan.

More research is needed to understand how these pathways interact.

Why Do Studies Produce Different Results?

One of the biggest challenges in longevity research is that human populations are extremely diverse.

A study performed in one country may produce different results from a study performed somewhere else.

This can happen for several reasons.

Genetic differences

Blood-type frequencies vary considerably between populations.

Other genetic differences may also influence disease risk and interact with the ABO system.

Lifestyle differences

Diet, physical activity, smoking, alcohol consumption, sleep, and other lifestyle habits can vary between populations.

These factors can influence longevity far more strongly than blood type.

Healthcare differences

Access to healthcare, preventive screening, medications, emergency treatment, and chronic disease management can also affect survival.

Study design

A study of centenarians is different from a study that follows thousands of people for decades.

Researchers must consider these differences when interpreting the findings.

Blood Type Is Not a Lifespan Calculator

It can be tempting to look at a study and ask, “Which blood type lives the longest?”

Science does not currently provide a simple answer.

There is no reliable formula that can take your blood type and predict your lifespan.

Even if one blood group appears more frequently among people who reach 100 in a particular study, that does not mean the blood group caused those people to live longer.

There may be other explanations.

For example, the population could have unique genetic characteristics, lifestyle patterns, environmental exposures, or healthcare conditions.

The finding could also be influenced by statistical variation.

That is why scientists look for consistent results across multiple populations and studies before drawing strong conclusions.

Does Your Blood Type Affect Your Diet?

Another popular claim is that people should eat according to their blood type.

This idea has become widely known as the “blood type diet.”

However, there is not strong evidence showing that people need completely different diets based on whether they have type A, B, AB, or O blood.

A healthy diet should instead take into account overall nutritional needs, medical conditions, age, activity level, and individual circumstances.

For example, someone with diabetes may need to pay particular attention to carbohydrate intake, while someone with certain kidney conditions may have different nutritional requirements.

Blood type alone does not provide enough information to determine an individual’s ideal diet.

What Actually Helps People Live Longer?

While researchers continue to investigate blood type, there are many longevity factors that have stronger evidence behind them.

Healthy aging is generally associated with maintaining good cardiovascular health, avoiding tobacco, staying physically active, eating a nutritious diet, maintaining a healthy weight, getting sufficient sleep, and managing chronic conditions.

Regular medical care also matters.

High blood pressure and high cholesterol can develop without obvious symptoms. Identifying and treating these conditions can reduce the risk of serious complications.

Likewise, avoiding smoking remains one of the most important steps a person can take to protect long-term health.

These strategies apply regardless of blood type.

Could Blood Type Become More Important in Personalized Medicine?

Although blood type cannot currently predict lifespan, researchers may eventually learn more about how ABO-related genetics interact with disease risk.

Personalized medicine aims to use biological and genetic information to better understand an individual’s risk and determine which interventions might work best.

Blood type could potentially become one piece of a much larger health profile.

However, it is unlikely to be useful as a standalone measure.

A person’s medical history, family history, genetics, laboratory results, lifestyle, and environmental exposures all provide additional information.

The future of research may therefore focus less on asking which blood type lives longest and more on understanding how blood-group biology interacts with other factors.

What Should You Do With This Information?

If you know your blood type, there is no reason to become worried simply because research has identified associations between blood groups and certain diseases.

Likewise, there is no reason to assume that having a particular blood type gives you special protection from aging.

Instead, think of blood type as one inherited characteristic.

It may influence certain biological pathways, but it is only a small part of the overall picture.

If you are concerned about your personal risk of heart disease, stroke, blood clots, cancer, or another condition, talk with a qualified healthcare professional. Your individual risk can be evaluated using factors that are much more informative than blood type alone.

Frequently Asked Questions

Which blood type is linked to the longest life?

There is no scientifically established blood type that guarantees longer life. Studies have produced conflicting findings, and recent research has not shown that ABO blood type is a major determinant of longevity.

Does type O blood mean you will live longer?

Not necessarily. Type O is associated with lower levels of certain clotting-related proteins and a lower risk of some clotting conditions, but that does not mean people with type O automatically have longer lifespans.

Is type B a longevity blood type?

Some earlier research found that type B was more common among certain groups of centenarians. However, other studies found different results. The evidence is not strong enough to classify type B as a longevity blood type.

Can blood type predict my life expectancy?

No. Blood type cannot accurately predict an individual’s life expectancy.

Does blood type affect heart disease risk?

Research suggests that ABO blood groups may be associated with differences in cardiovascular and clotting risks. However, blood pressure, cholesterol, smoking, diabetes, exercise, diet, and other factors are also extremely important.

Should I change my diet based on my blood type?

There is not sufficient evidence to recommend a specific diet solely because of your ABO blood group. A balanced eating pattern should be based on established nutritional principles and individual health needs.

The Bottom Line

The connection between blood type and longevity is an interesting area of scientific research, but it is not as straightforward as some headlines make it appear.

Blood type can influence certain biological characteristics, including factors involved in blood clotting. Researchers have also identified associations between ABO blood groups and several diseases that can affect health as people age.

However, studies examining whether one blood type helps people live longer have produced inconsistent results.

Some research has suggested possible relationships between particular blood groups and exceptional longevity, while other studies have found no significant association at all. Recent evidence continues to suggest that blood type should not be considered a major independent predictor of lifespan.

In practical terms, your blood type is not your destiny.

Whether you live a long and healthy life depends on a complex combination of genetics, lifestyle, environment, medical care, and countless other factors.

Rather than focusing on whether your blood type is supposedly “better” for longevity, concentrate on the factors you can actually influence. Maintain a healthy lifestyle, monitor important health measures, manage chronic conditions appropriately, stay physically active, avoid tobacco, and maintain regular medical care.