I have been with somebody 12 years younger than me for 10 years. I felt bad about that at first but the age difference never felt like a problem (her dominant and manipulative nature was). But the result is that I have been spending lots of time with people in that age bracket. Also, having no kids, I have the feeling that women my age live in an entirely different world. I am not necessarily not-interested but somehow I rarely feel at ease around women my age. And also, I have two tango places I visit regularly. At one place, most people are much older (as in retired), at the other most are much younger (below 40 or even below 35) and most come as a couple (they are open to dancing with other people but won't date).

For the record: when I was in my twenties, I used to fall for women who were my age or two years older ...