120 folders. I actually dont have a preference in this matter. But if it were to put every image inside its race folder without a folders for sex and age, then it would have to sort the tags starting with Sex Age or Age Sex.
EDIT: scratch that. only Sex Age order would do. Having males mixed with females when the images are sorted alphabetically would be a serious pain.
Yeah, actually gender folders would be necessary. Age is a weird one, not many pictures are even tagged with it yet, but they undoubtedly will be. It's just quite nice to have a look at all the pictures you downloaded without going into the game, though there's something to be said for an element of surprise when catching slaves.
If you search the whole bodies folder for "skin" you can still check them all out at once.
