Inference on the stellar age of the lensing galaxy by comparing the observed magnitude ( Kp = 22.15) with M05 models of varying ages. The solid (dotted) curves represent a stellar fraction f _* = 1 ( f _* = 0.9), while the vertical dashed lines denote the age of the universe at the assumed lens redshift. The two sets of curves represent lens redshifts of z _l = 1.145 (black) and z _l = 0.645 (red); the lens redshift z _l = 0.218 leads to stellar population ages older than the age of the universe at that redshift for f _* > 0.3.