Scatterplot showing latency to reward relative to mouse age. While there are two clear age cohorts (all within the category of mature adults), there is no apparent relationship between age and reward latency. Color code denotes experimental group assignment. CB: n = 41 (19 males); MV: n = 38 (21 males); PEA: n = 40 (19 males). CB, clean bedding; MV, methyl valerate; PEA, phenylethylamine; M, male; F, female.