The [C/N] versus ﹩\mathrm{log}\,(\mathrm{Age}[\mathrm{yr}])﹩ distribution for the final sample, composed of T. Spoo et al. (2022) open cluster sample and globular clusters 47 TUC, M 71, M 4, and M 5. Clusters represented by blue circles are from the final calibration sample of T. Spoo et al. (2022). Globular clusters 47 TUC, M 71, M 4, and M 5 are represented with an indigo square, an orange thin diamond, a cyan left triangle, and a red right triangle, respectively. Our new linear fit is shown as a solid black line, and the fit’s error envelope is shown with the gray region. The accepted age of the Universe is shown as a vertical gray dashed line. The open clusters used in our asteroseismic age comparison are NGC 2682 (M 67), NGC 6791, and NGC 6819 and are shown by a black-outlined red square, green circle, and blue triangle, respectively.