The Immune Systems of 110-Year-Olds Are Hiding a Remarkable Secret

Rare cancer-killing T cells expand markedly in some exceptionally old adults, suggesting the immune system may continue adapting even at extreme ages. Among people who live past 100, the immune system may not simply weaken with age. Instead, rare immune cells known as CD4 cytotoxic T lymphocytes (CD4 CTLs), which can kill tumor cells in [...]