Could something as basic as your blood type impact your longevity? A recent Japanese study suggests it might.

Researchers studied 269 centenarians in Tokyo and found blood type B was significantly more common among them. A separate study reinforced this, showing those with blood type B had fewer signs of accelerated organ aging, likely due to better cell regeneration and metabolic stress response.

Blood type B is defined by the B antigen on red blood cells and anti-A antibodies, which may offer stronger protection against oxidative stress—a key factor in aging. However, this blood type isn’t without risks. Other research links it to a slightly increased chance of cardiovascular issues, prompting experts to stress the importance of a healthy lifestyle for those with type B.

More broadly, blood types affect disease risk. Types A, B, and AB are more prone to heart attacks and pancreatic cancer due to higher clotting factors and bacterial interactions. Meanwhile, type O offers some protection from malaria but may be more susceptible to strep infections.

Some advocate blood type-specific diets, though scientific backing is limited. Still, no matter your type, lifestyle choices—like diet, exercise, and stress management—remain the most powerful tools for healthy aging.