Short version:

They can be actually better at the various techniques of both romance and having sex than younger women, due to being more practically experienced.

They can be much more direct and straightforward with what they want, what the boundaries and rules and expectations of the relationship are, more skilled at communicating these things, less likely to lead to some kind of high drama / situationship type scenario.

They can be ... basically just innately complimented/flattered by the idea that they are appealing to younger men, that they 'still got it'.

They can be more mature, in the sense of having a stable, functional self-image and living situation/economic status, a greater set of life knowledge and 'academic' type, deep subject knowledge, thus interests and taste/style, and a greater ability to self-regulate their emotions.

Things like these can make courting such a woman a more appealing prospect, a more rewarding prospect, a more attainable goal for a younger guy, as compared to dating other women, closer to their own age.