Relation between the age and the location of the H-peak is extracted from four sources. The location of the observed H-peak (blue points) were measured as a local maximum in Figs. 3 and 4. The error bars indicate the uncertainty range of the peak using the size of the kernel bandwidth as half of the error bar length, and the center dot indicates the position of the peak. The green squares are from Piskunov et al. (2004). The black bars represent the range in magnitudes where the H-peak in the LF curve occurs as a local maximum, and the range of the bar is twice the bin size (0.25 mag). The green and yellow dots are critical points from the PARSEC evolutionary tracks, the relative location of the dots on the Hertzsprung–Russell diagram can be found in Fig. C.1.