How does aging impact our ability to fight off disease, and what role does COVID-19 play in accelerating this process? In this video, we dive into groundbreaking 2026 research exploring “immunosenescence”, which is the progressive decline in immune function as we get older. By analyzing the T cell and B cell receptors (TCRs and BCRs) of 195 healthy Chinese individuals and 94 post-COVID-19 patients, scientists have uncovered how our immune repertoire physically changes over time.