(Deconvolved) probability density function (PDF) of the ages of solar twins determined with M_Ks. The dotted black line shows the normalized age histogram of our solar twin catalog (same as the blue histogram in Fig. B.1). The blue line shows the normalized ratio between the observed and mock age histograms, as a rough estimate of the intrinsic age distribution. Orange and green lines represent the deconvolved, intrinsic age distributions obtained using the two different (RLS and RL) methods. Shaded regions indicate the statistical uncertainty in the deconvolved PDFs, estimated from 10⁴ Monte Carlo realizations assuming Poisson statistics for the original age histogram (see Appendix C for a validation of this uncertainty estimate). The upper axis provides reference R_birth values, based on the [Fe/H] = 0 dex slice of the age–R_birth–[Fe/H] relation in Ratcliffe et al. (2023). See Fig. D.1 for results using log g and those using M_G.