There is no age cap. Thing is..
First, do a woman truely want a "good" man? Next, what is she doing to attract said man?
However, I would like to know what does a woman feel is "good" to her? Goodness is relative, so what may be "good" to one woman may be "no good" to another woman.
I will stress that the older a woman gets, the more difficult it may be for her to find someone that fits her mold.