Age dependence of the Li depletion in the Sun computed using our parametric model of convective settling compared with the Li abundances in four solar twins and in solar-type stars of three open clusters (the Sun is a calibration point and the Pleiades set the initial condition for Li in our model; see Sects. 2.3.2 and 3.1). The thermal stratification in the model plotted by the dotted line is not allowed to evolve in time. The abundances in the open clusters are from Sestito & Randich (2005) and correspond to the solar effective temperature at the age of the cluster; the error bars show the typical scatter in the data. The measurements in 18 Sco and HIP 102152 are from Monroe et al. (2013), and those in HIP 56948 and HIP 114328 from Meléndez et al. (2012, 2014).