Mass and ages of RGB stars in the metal-poor regime for a) four metal-poor RAVE stars with K2 seismic oscillations presented in this work (red diamonds); b) nine APOKASC the objects from Epstein et al. (2014) (original values as empty black circles; our new determination using PARAM and APOGEE-DR14 atmospheric parameters and abundances are shown as filled red circles), and c) seven stars in M4 from Miglio et al. (2016) recomputed with PARAM in this work (yellow triangles).