Some guys are like that. But in my example (or I guess you could call it my model), I had guys interested in women at or below their age, and women interested in men at or above their age. In reality, it differs for each person, but average age preference is probably a right or left skewed bell curve for women and men.
And of course, women probably aren't attracted to older men simply because they are older, they're probably attracted to the life and professional accomplishment, maturity, financial resources, and so forth - sorry bruddas, but merely aging is not going to help things here.
On the flip side, the numbers really do start to look grim for single women as they approach 40. A lot of women enjoy the dating scene when they are in their early 20s, get married around 30, and stay happily married their whole lives - and never really feel any of the frustration of being on the wrong side of the dating equation. However, this means that most of the disadvantage gets concentrated onto a fairly small number of women, who basically get the full brunt of it.