Age determination for KELT-23A. Plotted are KELT-23A with 1σ uncertainties (red) and the best fitting MIST track (gray) with the shaded region representing 1σ uncertainties on the host star's mass from our global fit. The M⋆ and ﹩{\left[\mathrm{Fe}/{\rm{H}}\right]}_{0}﹩ of the host star are determined in Section 4.1 and are used in the Hertzsprung–Russell (HR) diagram analysis (Section 3.3). Blue dots represent the position along the track at 1.0, 5.0, and 10.0 Gyr.