免疫衰老
免疫衰老（英语：immunosenescence）是一种随着年岁的增长，免疫系统逐渐退化的过程。在2020年的一项研究指出，后天免疫系统比先天免疫系统更受老化影响。[1]免疫系统包括生物对感染及免疫的长期记忆。由年龄引起的免疫缺陷在长寿及不长寿的物种也存在。[2]
免疫衰老现象，已在猴子及老鼠等动物研究过 [3][4][5]。免疫衰老是一个导致老年死亡重大的原因。免疫老化，与株落失能和T-细胞灭绝, 是造成免疫系统失灵的重大原因。不过，T-细胞减少及株落失能仍有机会逆转，但截止2020年，没有任何方法及技术，可以逆转免疫衰老。[6][7]
免疫衰老，并不是一种随机的退化现象。相反，它似乎概括了一种逆向的演化模式。大多数受免疫老化影响的因素，似乎都受到遗传与基因的控制。[8]
参考文献
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