Distribution of ages for all MMR subgroups in terms of density. Left panel: Entire distribution with both histograms and 1D Gaussian kernel density plots, including the outliers of younger age. Right panel: Similar to the left panel, but without the histograms and zoomed in within 8.5≤log(t)≤ 11.5. Additional vertical lines are added to depict the medians of each distribution (with symbol for the 50th percentile of the age distribution), with the same corresponding colours for each MMR subgroup.