Ranges of ages (left) and masses (right) derived from stellar model optimization for HD 52265. In the abscissae, we list the case numbers as defined in Table 3. For each case, several model optimizations can be identified according to the symbols and colours indicated in Table 2. In addition, open red symbols are for additional models of set A described in Table A.1 of Appendix A.2: circles are for different, low Y₀ values, square and diamond are for low and high α_conv values, small diamonds for models with large core overshooting. Red stars illustrate the Y₀-M degeneracy in cases 6 and 7, but the inferred range is the same for all cases.