  The main goal of this work is to evaluate the correlation between Li
abundance, age, and mass. Using high-quality ESO/HARPS data (R $\simeq$ 115
000; 270 $\leq$ SNR $\leq$ 1000), we measured Li abundances via spectral
synthesis of the 6707.8 \r{A} $^7$Li line in 74 solar twins and analogs. Our
joint analysis of 151 Sun-like stars (72 from our sample plus 79 solar twins
from a previous study) confirms the strong Li abundance-age correlation
reported by other works. Mass and convective envelope size also seem to be
connected with Li abundance but with lower significance. We have found a link
between the presence of planets and low Li abundances in a sample of 192 stars
with a high significance. Our results agree qualitatively with non-standard
models, and indicate that several extra transport mechanisms must be taken into
account to explain the behaviour of Li abundance for stars with different
masses and ages.
