Ensemble of plots summarising the final performances on the MCK-APOKASC training-test sample. Panel a: evolution of the median of the absolute value for the fractional error on age per bin. Panel b: comparison of the ages of reference and those predicted by the model. The black line is the identity function ∣ΔA/A∣is the absolute fractional error on age. The black error bars represent the means of the errors in age. Panel c: evolution of the standard deviation of the fractional error on age per bin. The vertical-horizontal bar depicts the mean value for the whole age range. Panel d: histogram of the absolute fractional error on age. Panel e: bar plot of the feature importance for all the retained features. Panel f: Plot of the learning curves.