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Copyright © The Author(s) 2020. Published by the Genetics Society of America.Aging is accompanied by a progressive decline in immune function termed "immunosenescence". Deficient surveillance coupled with the impaired function of immune cells compromises host defense in older animals. The dynamic activity of regulatory modules that control immunity appears to underlie age-dependent modifications to the immune system. In the roundworm Caenorhabditis elegans levels of the PMK-1 p38 MAP kinase diminish over time, reducing the expression of immune effectors tha