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A proposed set of descriptors for functional senescence data

Declines in function 1 are common manifestations of aging in many phyla ( Arking, 1998 ). As functional senescence is thought to drive the increasing risk of death with age, understanding functional senescence is important for understanding aging. Experimental investigation of functional senescence requires one to quantitate and compare age‐dependent declines in function between cohorts. Such quantitation and comparison is often difficult owing to complexities in functional senescence data sets. Here, we discuss issues related to describing and contrasting age‐related declines in function.