Context :

Aims : We determine the age and mass of the three best solar twin candidates in open cluster M67 through lithium evolutionary models .

Methods : We computed a grid of evolutionary models with non-standard mixing at metallicity [ Fe / H ] = 0.01 with the Toulouse-Geneva evolution code for a range of stellar masses .
We estimated the mass and age of 10 solar analogs belonging to the open cluster M67 .
We made a detailed study of the three solar twins of the sample , YPB637 , YPB1194 , and YPB1787 .

Results : We obtained a very accurate estimation of the mass of our solar analogs in M67 by interpolating in the grid of evolutionary models .
The three solar twins allowed us to estimate the age of the open cluster , which is 3.87 ^ { +0.55 } _ { -0.66 } Gyr , which is better constrained than former estimates .

Conclusions : Our results show that the 3 solar twin candidates have one solar mass within the errors and that M67 has a solar age within the errors , validating its use as a solar proxy .
M67 is an important cluster when searching for solar twins .