When I was a baby dyke, I tended to date older but not a lot older...they were usually in their early 20's. As I moved into *my* 20's, I tended to be attracted to women in their 30's although I did have a few short-lived relationships with peeps in their early 50's. Once I hit my 30's, then I had more relationships with people who were my age or perhaps in their 40's- the kids in their 20's just tended to have too much of an issue with income disparities. And now that I am in my 40's, I tend to find that I am usually dating within a year or two of my own age...
But...I don't look at age initially. It is more about finding the common interests...they either exist or they don't. And if they aren't there, then it is not worth my time to pursue the relationship...