Which lymphatic system organ involved and becomes nonfunctional as aging occurs?
The human immune system weakens significantly with age, a process driven by changes in key lymphatic organs. The central lymphatic organ involved and becomes nonfunctional as aging occurs is the thymus, which begins to atrophy shortly after birth and is a major contributor to immunosenescence. This gradual decline directly impacts the body's ability to produce new T cells, leaving the elderly more vulnerable to illness.