Correlation between Li abundance and age for solar twin stars. The circles show stars that have well-determined Li abundances (19 stars) and the triangles those that only have upper limits on their Li abundances (10 stars). The definition of a solar twin is here: T_eff = 5690−5870 K, log g = 4.25−4.50, and [Fe/H] = ±0.11. The colouring shows the relative age uncertainties of these stars (that can be substantial as these solar twin stars are located on the upper main sequence). The diagonal line shows the relationship between Li and stellar age from Carlos et al. (2016).