Males are sexually visual creatures. Any male ten and up who sees a hottie will be attracted to her and fantasy about having sex with her. It's the way males are programmed, and you can't change it. As for older males (let's say 45+) going for the younger females, well of course. Who doesn't like young, firm flesh? Great for a short term relationships where who the other person is doesn't really matter. Males looking for more long term tend to want to be attracted to the person as well as the body.
I think, in general, older male doms like younger females not just for the young flesh, but b/c there is a good chance she is new and inexperienced and therefore might believe his BS.
Many males think they can slap a "Dom" label on their forehead and have a better shot at getting younger females. To a certain extent this is true, as the young and inexperienced tend to make mistakes. A very newbie sub might think that desktop Dom knows ever so much more and is such a perfect father figure. These relationships tend not to last long, b/c the newbie girl grows up.
Yeah yeah, I am sure there are young female, older male relationships that work just fine. But that's b/c its based on more than pure physical attraction on the part of the male and more than seeking a father figure on the part of the female.
Some soften by the forced reflection that comes from loss; others harden. Which are you?