People have always admired Japan for its high life expectancy, which is often connected with a balanced diet, active lifestyle, and genetics. But could blood type also play a role in the aging process? Research suggests there might be a connection.

The ABO system classifies blood into four groups—A, B, O, and AB—each inherited from parents. Scientists have explored whether these blood types could influence how people age. Notably, studies indicate that individuals with blood group B may experience a slower aging process compared to others.

A 2004 study in Tokyo examined 269 people aged 100 and above and found a higher prevalence of blood group B among them. This raised the possibility that certain blood groups might be linked to extended lifespan.

Researchers have since delved deeper, trying to understand whether unique cellular repair mechanisms or a better ability to manage metabolic stress could be responsible for this phenomenon.

The 2024 study examines aging across organs

In 2024, a large-scale study involving over 5,000 participants provided new insights into ageing. Researchers analyzed the biological age of 11 organs and examined over 4,000 proteins in the bloodstream. Their findings show that around 20% of people experience accelerated aging in at least one organ. While the blood group wasn’t the only determining factor, the study contributed to ongoing discussions about genetics and longevity.

Stroke risk and blood type A

While some blood groups may have aging advantages, others might carry health risks. A 2022 study by the University of Maryland School of Medicine found that people with type A blood have a higher risk of early strokes before the age of 60 compared to those with type O blood. Published in Neurology, the study examined data from 16,730 stroke cases and nearly 600,000 non-stroke individuals, highlighting a potential genetic predisposition.

Although blood type alone cannot determine lifespan, these studies suggest it may offer clues for better health planning. Understanding potential risks could help individuals take preventive measures, such as monitoring cardiovascular health or making lifestyle adjustments.

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