The position of HD 123351 (dot) in the theoretical H-R diagram (log L/L_⊙ vs. log T in K). Shown are evolutionary tracks for masses of 1.1–2.5 M_⊙, solar metallicity, and core overshooting (dotted lines; Pietrinferni et al. 2004). The best-fit model track (full line) suggests a mass for HD 123351 of 1.2  ±  0.1 M_⊙. The insert is a zoomed image of the box around the observed location indicating the nominal ages of the 1.2-M_⊙ track (again the full line) and a 1.1-M_⊙, 1.3-M_⊙, and 1.5-M_⊙ track (dotted lines), respectively. This suggests a most-likely age of HD 123351 of 6–7 Gyr.