When T cells get younger, the body remembers how to heal. At the onset of their lifespan, CD4⁺ T cells unleash a regenerative code: telomere “Rivers” transferred from antigen-presenting cells spread youth across aged tissues and organisms. This transfer biology also dismantles HIV latency — enabling the first functional cure. Medicating this process revives terminally differentiated T cells, restores telomeric length, and reprograms stem-like responses. Rather than terminal decline, the end of a T cell marks renewal and reveals properties not previously existent. Age, once a boundary, becomes reversible — through the flow of telomeres. Thus, the immune system possesses self-healing properties that can be transplanted.