Studies suggest people with a certain blood type may have a greater chance of reaching 100, as researchers explore links between genetics, longevity, heart health, inflammation, lifestyle factors, and disease resistance, sparking curiosity about how blood type might quietly influence aging, survival, and the odds of becoming a centenarian worldwide.

A large Swedish study found that people who lived longest often had slightly healthier blood sugar, cholesterol, inflammation, and kidney markers during midlife. The differences were usually small, but they appeared consistently decades before old age.

Stable blood glucose may reduce long-term damage to blood vessels and lower the risk of heart disease, stroke, and cognitive decline. Moderate cholesterol levels, lower chronic inflammation, and stronger kidney function may also help the body remain healthier over time.

Blood type appeared to have only a minor influence and cannot determine lifespan. Overall, longevity seems to result from many small advantages working together, including genetics, healthy habits, resilience, environment, and long-term biological balance.