Immune senescence is the gradual deterioration of the immune system that occurs as a person ages. This decline in immune function can lead to increased susceptibility to infections, diseases, and decreased response to vaccines. It is characterized by changes in the composition and function of immune cells, as well as alterations in the production of inflammatory factors. Researchers in this area study how immune senescence contributes to the development of age-related diseases and explore potential interventions to boost immune function in elderly individuals.