Results of the age inversion for box test data. Upper panels are for the smaller MAMC (n_mock = 250), and lower panels are for the larger MAMC (n_mock = 5000). Left panels are for the smaller simulated survey (n_sim = 1000), and right panels are for the larger simulated survey (n_sim = 25 000). The solid blue line shows the input log(age) distribution, and the solid red line is the result of the inversion with 68- (dark shading) and 95 (light shading) percent confidence intervals. Input log(age) PDFs for five realizations of the simulated catalogue are plotted with grey lines and the black dashed line shows the log(age) PDF inferred from the inversion result. The inset in each panel shows the cross-validation curves (red) and piecewise-linear fit (blue) for one realization of the simulated catalogue (see Sect. 3.3 for the description of the cross-validation curve).