Age indicators for the stars in the sample. From top-left: R_X = log L_X/L_bol vs. B − V; log R_HK vs. B − V; rotation period vs. B − V; lithium equivalent width vs. B − V; U vs. V space velocities; and U vs. W space velocities. In all the panels, the black stars represent the targets. In the R_X, log R_HK, rotation period, and lithium plots, orange circles represent β Pic MG; red circles: Tucana-Columba-Carina MG; light blue circles: AB Dor MG; green circles: Pleiades OC; purple circles: Hyades OC. In the R_X vs. B − V and EW Li vs. B − V panels, the filled squares represent the median value of R_X and EW Li for the corresponding color bin. In the log R_HK plot, green and purple lines represent the locus populated by Pleiades and Hyades stars, respectivey. In the latter two panels, the positions of some young moving groups are marked as open circles. The dashed-line box in both panels is the locus of the Nearby Young Population as defined in Zuckerman & Song (2004). The dotted contours in the U vs. V plot show the locus of kinematically young stars proposed by Montes et al. (2001).