[Versus] After the Rain, Ristorante Paradiso, and the delicate art of the age-gap romance

At first glance, Ristorante Paradiso and After the Rain bear remarkable similarities. Both are anime adaptations of manga series written by women that center around a May-September romance. Both star a young woman and a middle-aged divorcee. Both even feature characters who work at a restaurant together! So why does Ristorante Paradiso leave me with the warm fuzzies, while After the Rain just leaves me feeling vaguely skeevy?