Age (in log t) and mass (in log M) distributions for the TWA stars listed in Table 5 obtained with the grid of evolutionary models computed by Siess et al. 2000 (upper panels) and Baraffe et al. 1998 (lower panels). TWA 9A, TWA 21 and TWA 23 are the stars plotted near log t = 7.5, and TWA 11A is the star plotted near log (M/M_⊙) = 0.5 in the upper panels. The Barrafe tracks do not cover such large masses.