I have had dates and partners with age difference in both directions, and I don't think it has anything to do with age.
If anything, my take on it is that young men have more of a tendency to be players to get what they want, older men are still players, but it is more seductive, charming and appreciative.
The younger men that I like are not the type that are players, and seem to not be appreciated by women their own age. Again, a generalisation, young women go for the 'fashionable thing' rather than looking for the characteristics they would find desirable in a partner.
Summary points:
- confidence is one of the sexiest things going, most seem to have more of this with age
- some people are quite natural at being seductive, age may help to develop it, but this is not a given
(do you think I could be more clinical?)