There’s a growing suggestion that one’s blood type — particularly the familiar ABO categories (O, A, B, AB) — might play a role in how the body ages beyond the usual factors of lifestyle, diet, and genetics. Some popular discussions point out that people with blood type O may enjoy health advantages, such as lower cardiovascular risks or better blood flow, potentially slowing physical decline. Meanwhile, types A, B, or AB have been linked in certain studies with slightly higher risks of inflammation, high blood-pressure, and age-related neurological issues.

However, digging into the scientific literature reveals that the evidence is limited and not definitive. For example, a large 2015 study found that non-O blood groups were associated with a modestly increased risk of death, especially from cardiovascular disease.  More recent research looking directly at blood group distribution among people aged 85+ found no significant difference in longevity by ABO/Rh group — suggesting that blood type alone doesn’t strongly determine how long or how well one ages.

What science does reliably show is that our blood — including red blood-cell indices, stem-cell clone diversity, and biomarkers like DNA methylation and telomere length — changes with age. These changes reflect the aging process (often called “biological aging”) and are useful in tracking how fast someone is aging. While blood type could hypothetically influence some of these processes (for instance via clotting differences or iron metabolism), causal links remain speculative at this time.

In short: yes, there’s an interesting hypothesis that blood type may contribute to aging differences, but the bulk of evidence emphasizes lifestyle, environment, and genes as far stronger determinants of aging quality. Whether you’re type O, A, B or AB, focusing on proven habits — balanced diet, regular exercise, good sleep, stress management, and preventive health care — remains the most effective strategy for aging well.