Evolution of the surface lithium abundances in the slow (left) and fast (right) rotating models as a function of time. The open boxes represent the ranges of lithium abundances determined by Sestito & Randich (2005) for the following clusters and associations: NGC 2264 at 5 Myr, IC 2391/IC 2602/IC 4665 at 30 Myr, Pleiades/Blanco1 at 80 Myr, NGC 2516 at 150 Myr, M34/M35/NGC 6475 at 250 Myr, Hyades/Praesepe/Coma Ber/NGC 6633 at 600 Myr, NGC 752/NGC 3680/IC 4651 at 2 Gyr and M67 at 4.5 Gyr. The Sun is also indicated with the solar symbol ⊙.