Only n=1 and I guess I'm an outlier, but: I can get attracted to a wide range of physical appearances (including age) if the person is empathic and/or intelligent. However, I never get attracted to someone who lacks those attributes, no matter how physically attractive they might be. In fact I find the combination of being physically attractive but cold and or dumb even a bit repulsive.
The numbers behind the OKCupid graph are likely based on physical attractiveness. The conclusion to draw is that men are more likely to find women of a certain age physically attractive.
As you say there are other factors based on which men choose life partners... If it were not so, every single man whether 20 or 99 would be hanging out around college campuses trying to 'pick up chicks'.