WBC (White Blood Cell Count) is a commonly used biomarker in longevity research. It serves as an important indicator of overall immune health and systemic inflammation, both of which play crucial roles in the aging process. A higher WBC count may suggest chronic inflammation and increased oxidative stress, which are associated with age-related diseases such as cardiovascular disease and cancer. Monitoring WBC levels over time can provide valuable insights into an individual’s immune status and overall health trajectory. However, it’s important to consider other factors such as age, gender, and underlying health conditions when interpreting WBC results for longevity purposes.