Comparison of the evolutionary ages (upper panel) and the rotational ages (lower panel) for the extrasolar planet host stars of Maxted et al. (2015) with those derived in this paper using the Yonsei-Yale isochrones of Demarque et al. (2004) and the additive gyro-age formula Eq. (5) of this paper. The continuous line indicates the identical values for the quantities corresponding to the labels. We note that the panels have different ranges.