Evolutionary tracks for solar composition stars from 10 M_⊙ to 35 M_⊙ computed with moderate overshooting (α_over = 0.2) during core hydrogen burning (main sequence), and the subsequent helium core contraction. These and the ZAMS are represented with thick black lines. Labels on the ZAMS indicate the initial masses, given in solar units. Blue lines correspond to isochrones, labelled with their ages in million years. The observed error boxes for the components of HD 96264A are given in thick solid red lines. These are consistent with an age of ≈4.5 Myr for both components of the pair.