The cellular factors that impair the germinal center in advanced age.

Long-lasting immunological memory is a core feature of the adaptive immune system that allows an organism to have a potent recall response to foreign agents that have been previously encountered. Persistent humoral immunity is afforded by long-lived memory B cells and plasma cells, which can mature in germinal centers (GCs) in secondary lymphoid organs. The development of new GC-derived immunity diminishes with age, thereby impairing our immune system's response to both natural infections and vaccinations. This review will describe the current knowledge of how aging affects the cells and microenvironment of the GC. A greater understanding of how the GC changes with age, and how to circumvent these changes, will be critical for tailoring vaccines for older people. This area of research is critical given the twenty-first century will witness a doubling of the aging population and an increased frequency of pandemics.