Great point -- I've noticed the same thing. At our old New Mass parish, I called them the "flock of starlings." As soon as the priest said "Mass is ended, go in peace," they broke out into conversation like a flock of birds. We also noticed that the Saturday afternoon Mass was attended almost exclusively by those old enough to have lived before Vatican II. My theory is that this group feels like they are getting away with something by going to Mass on Saturday. Sort of like kids getting let out of school early.
Do you mean people of Baby-Boomer age? That would make sense to me. According to a book that I read titled "The New Faithful" by Colleen Carroll, the Baby-Boomers trend to be less orthodox, and those of my generation, born in late 1960s until the early 1980s, have many more orthodox worshippers who seek the more traditional devotions like Eucharistic adoration. It's a good book.
Just a tidbit related to your FR name, you obviously know that Desdemona is a Shakepearean name, but did you know there is a moon of Uranus named Desdemona? It was dicovered by the Voyager 2 space probe in 1986.