CMD of KK 153 with isochrones superimposed after correction for the distance measured in this paper (D = 3.06 Mpc, left panel) and for the distance estimated by Xu et al. (2025, D = 2.0 Mpc, right panel). The isochrones that display the RGB phase have metallicity [M/H]= − 2.0 (black), [M/H]= − 1.5 (yellow), and [M/H]= − 1.0 (red). For each metallicity, isochrones of two different ages are plotted, 5.0 Gyr and 10.0 Gyr, where in each pair the older isochrone is redder than the younger one. Two age ≤ 100 Myr isochrones with [M/H]= − 1.0 are also superimposed on both CMDs with the aim of fitting the handful of young KK 153 stars included in our sample. The young isochrones in the left panel have an age = 40 Myr (in cyan), and 63 Myr (in blue), and in the right panel age = 63 Myr (in cyan), and 100 Myr (in blue).