The measurement of chronological life span (CLS) in Schizosaccharomyces pombe is traditionally performed by plating back aliquots of aging liquid cultures on solid medium and counting the number of colony-forming units (CFU). However, this method is labor and cost intensive and therefore not amenable to high-throughput screening. Here, we describe a simple method for CLS measurement using aging minicultures in microtiter plates and batch plate-back for the determination of culture viability. This assay can be used to screen a large number of strains, conditions, or compounds in parallel for effects on aging. 