Generally speaking, I prefer girls just a little older than me. They tend to be more self-assured, though I enjoy when they show a little vulnerability too. Especially taller women!
Honestly, I don't really have a preference but when you look at my sexual partner history most of them were older than me haha Although it's not really surprising, considering I used to be a sex worker.
Now that I think about it though, if I was in a relationship with a woman I would prefer if she was older than me :P