"More" depraved?---probably not; but possibly tending to actually engage their fantasies..
More disgusting---I think that too, but probably because I have a cultural bias to think that sexuality belongs only to the young and the pretty in the first place.. (And that's just my reaction to sexuality and older people---my wife and I still find our sexuality to be a lot of fun.)..
And a personal anecdote:
About 20 years ago when I was around 50, I went to physical therapy for some muscle tightness in my hips and lower body..
The physical therapist was a girl in her 20's..
Of course she had to stretch some muscles and her first movement was to have me lie on my back and stretch my hamstring and hip muscles by pushing my leg up.. She was a rather thin girl and had to use her body weight to help her accomplish her purpose and it just so happened that my calf rested precisely on her breast..
She was just doing what was necessary, but I sensed she was immediately uncomfortable..
I motioned for her to come closer so I could talk to her..
I said, "I'm old enough to be harmless and too young to be a dirty old man. Just relax and do your job.."
From then on for about 6 weeks of therapy, we were both totally comfortable..