Convective turnover time (upper panel), the rotation rate of the saturation threshold (middle panel), and the X-ray luminosity at the saturation threshold (lower panel) as functions of age for different stellar masses. In the middle and lower panels, the transition from solid to dashed lines shows the time in the evolution for each mass when 90% of all stars have dropped below the saturation threshold. The convective turnover times are from Spada et al. (2013) and the saturation threshold is calculated assuming a saturation Rossby number of 0.0605.