Top: near-infrared (M_K, J − K) – color–magnitude diagram for a set of white dwarf cooling tracks (long dashed lines) at solar chemical composition (Z = 0.02) and scaled solar chemical mixture. The cooling tracks range from M = 0.55 to 1.0 M_⊙. The red solid line shows the WD isochrone for 14 Gyr, while the black filled circles mark different mass values along the isochrone. Bottom: same as top, but for a set of white dwarf isochrones. Lines of different colors display isochrones ranging from 7 (black) to 14 (red) Gyr.