Cumulative distributions for the target ages as estimated through our CMS analysis (black line) and through the Pecaut & Mamajek (2016) age map (red line). The two methods show a high degree of consistency. Also shown as a blue line is the distribution of ages from a direct isochronal analysis for some of the B-type stars in the sample, as determined in Pecaut & Mamajek (2016) based on models from Ekström et al. (2012). This latter method is less precise for a typical star in this sample relative to the other methods, and thus not used in this paper.