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020 S. Karger AG, Basel.T lymphocytes follow three main stages of differentiation during their lifetime history - memory generation, memory homeostasis, and immunosenescence. Current definitions of T cell immunosenescence now include distinct aspects of both T cell senescence and exhaustion. Multiple studies have indicated a loss of vaccine efficacy in old age, and because this period coincides with the onset of T cell immunosenescence, the latter has often been implicated in the loss of vaccine responsiveness. This chapter examines ch