Li abundance vs. effective temperature and chemical age derived considering the [Y/Al] and [Y/Mg] ratios as chemical clocks. In the left panel the position of members in the Pleiades (~100 Myr; Sestito & Randich 2005), Hyades (~600 Myr; Cummings et al. 2017), and M 67 (~4.5 Gyr; Pasquini et al. 2008) clusters are overplotted with red crosses, blue diamonds, and yellow triangles, respectively. Only the stars in our sample with the presence of the Li line are plotted.