Dude, this is so many kinds of wrong, and at the very least a completely unpredictable take on the MILF trend (this would be the GGILF trend I guess). I suppose whatever puts lead in your pencil is okey-doke, so long as it doesn't scare the horses, but I have to wonder about a young person who gets off watching elderly people have sex, and even if the market is actually older folks (which makes more sense), why do they want to bang their sons' wives?
I guess I'll just have to chalk it up to fundamental cultural differences, but while I've always found Japanese people and culture fascinating, they do have their share of rather unsettling trends, mostly it seems in game shows, cartoons, and porn. Weird, wild stuff.
Of course, as Ron at Center Face points out, we 'murkins are certainly no slouches when it comes to whoring out our daughters. I'm not exactly a Mennonite, but the day I see my daughter wearing something like that -- no matter what age she is -- I'm kicking her ass, then I'm kicking the ass of the person who sold it to her. True dat. Ten bucks says that outfit says "Juicy" or "Sassy" or some such across the ass.