Measured median age (blue dotted line), mean age (black line), and rms error (black error bars) for each measured spectral type in the output population with inexact distances, using the temperature-to-spectral-type conversions from Pecaut & Mamajek (2013). The uncertainty on the mean is smaller than the markers. Later spectral types show more rms scatter and younger average ages relative to the high-mass stars. The uncertainty on the mean is small, meaning that the measurement of different mean ages for F and M stars is robust, even though the scatter is large.