NLTE Li abundances vs. age for the Sun and solar twins observed at high spectral resolution and high S/N. The total error bar (± σ) of the Li abundance is about the size of the symbols, while the error bars in age are shown by horizontal lines. For comparison we show the models by Charbonnel & Talon (2005); do Nascimento et al. (2009); Xiong & Deng (2009); and Denissenkov (2010), shifted to reproduce our observed NLTE solar Li abundance. The model with initial rotation velocity of 50 km s^-1 was adopted from Charbonnel & Talon (2005). HIP 114328 is shown by a pentagon, and helps to define a clear Li–age correlation.