The image of the older, wiser, more mature, more respected and established female figure disciplining her younger charge is a solidly established stereotype. How much more powerful is the submission when those roles are reversed?
What an added bit of embarrassment it is for a spanked person submit to the authority of someone much younger...........but just as capable with a strap or paddle?
And there are all sorts of concocted rationales for how the younger party manages to secure the dominant role. The least appealing are the ones where the older person behaves irresponsibly to such a degree that the younger person in their life is forced to take charge and set them back on a disciplined path. The most appealing are the ones where the older party is just drawn to the younger person's strength and doesn't consciously focus on their age.....although at times still feel the added embarrassment of having a younger Top.
I have a couple of f/F stories with a reversal theme: "An Age Thing" & "Deep Pockets". If you have a thing for reversals and haven't read them, head over to the main website and check them out. (I will warn you. You won't find any 'Mom came home drunk again and I need to stop her destructive behavior'-type plots.)