[C/N] (left) and gyrochronology (right) ages calibrated in this work compared to asteroseismic ages (V. Silva Aguirre et al. 2017; M. H. Pinsonneault et al. 2025; Y. Li et al. 2025). The crosses in the right plot show stars that are likely going through weakened magnetic braking, defined by P_rot > Ro_critτ_c. The one star with asteroseismic ages ∼2 Gyr but has We can recover the asteroseismic ages using both [C/N] and gyrochronology, with a slight positive bias in [C/N] and a slight negative bias in gyrochronology.