From the front as well as from behind - well, absolutely flat woman. Only one advantage is obvious - well-designed orifices. And of course due to the flat buttocks it's very convenient to pull your partner in the anus, even without bending her over. And I don't see anything else interesting in this lady! The man is basically of age, so probably the determining parameter for him is the age of the woman and the possibility to work her anally!
The old horny man lucked out with a sexy granddaughter. After licking her slit, he first fucked her in the mouth with a deep gulp. And then fucked her in different positions. Grandpa's in good shape.