Left: predicted rotational evolution tracks for stars at the 10th (red), 50th (green), and 90th (blue) percentiles of the rotational distribution. The solid and dotted lines show the envelope and core rotational evolution, respectively, and the horizontal solid lines show the observational constraints on the percentiles. The dashed black line shows the time dependent saturation threshold for Ṁ, B_dip, and L_X calculated assuming a constant saturation Ro and the τ_⋆ values of Spada et al. (2013). Right: predicted L_X along each of our rotation tracks and comparisons to observed L_X values of single stars in several clusters with upper limits shown by ▽ symbols. The solid horizontal lines show the 10th, 50th, and 90th percentiles of the observed distributions of L_X at each age calculated by counting upper limits as detections. The two solar symbols at 4.5 Gyr show the range of L_X for the Sun over the course of the solar cycle. The scale on the right y-axis shows the associated L_EUV.