Age and mass of the exoplanet M_psini inferred from the mass of its host star. Colours are for optimized models of case 7 of Table 3 for different input physics, as listed in Table 2. Models for case 6 are plotted in grey, other cases are shown with open blue symbols. The group of models with low mass and age of ~2 Gyr are case 4 models, to be rejected because of their high initial helium abundance (see text).