(1) He's a dirty old man.
(2) Lots of dirty old men stood around looking at pornographic magazines.
(3) Jones : You dirty sod. You dirty old man!
(4) The dirty old man rattled on about sex in the office.
(5) This dirty old man deflowered several young girls in the village.
(6) What a terrible joke, you are a dirty old man.
(7) A dirty old man in the park exposed himself to that beautiful young girl.
(8) I have fear that my friend will someday be a dirty old man too.
(9) He was always trying it on. But now he's 71, it's causing problems. He's just a dirty old man.