Experts have proposed several biological explanations for why blood type could, in theory, play a small role in lifespan.
1. Circulation and Clotting Factors
Certain proteins that affect how blood clots differ slightly between blood types. For instance, people with non-O blood types (A, B, or AB) tend to have higher levels of clotting proteins, which could slightly increase the risk of cardiovascular issues. Over decades, this small difference might influence long-term health, especially if combined with other risk factors such as high cholesterol, smoking, or lack of exercise.
