Immunological Aging

Immunological aging refers to progressive changes in immune system structure, function, and regulation that occur with advancing age. These changes reduce immune responsiveness while increasing immune dysregulation. Aging alters immune cell development, signaling, and coordination, leading to reduced protection against infections and diminished response to vaccination. At the same time, immune tolerance mechanisms weaken, contributing to autoimmunity and chronic inflammation. Immunological aging affects both systemic immunity and tissue-specific immune surveillance. Reduced clearance of damaged cells and senescent cells further accelerates biological aging. Immunological aging is closely linked to frailty, chronic disease, and reduced resilience to stressors. Understanding immunological aging provides a framework for improving immune health, developing age-specific vaccines, and reducing disease burden in older populations.