Eosinophils (Absolute) are a type of white blood cell that play a significant role in the body’s immune response. Research has shown that levels of eosinophils can serve as a biomarker for longevity. As we age, the number of eosinophils in the body tends to decrease, and a lower level of eosinophils has been associated with increased mortality risk. Monitoring eosinophil levels over time can provide valuable insights into an individual’s overall health and potential longevity. By incorporating eosinophils as a biomarker in longevity research, scientists and healthcare providers can better understand the aging process and develop personalized strategies for promoting healthy aging.