How to use "gentlemen" in a sentence

I am saying, gentlemen, that you are very lucky!"

Well, good evening gentlemen." Carolina says, and the three men stop their conversation and smile.

'Good evening, gentlemen, I'm Constable Hurst

'Now, gentlemen, will you please get out of here.'

When old ladies and gentlemen look at him, tears come to their eyes.

I named three gentlemen in whose houses I had taught drawing.

He opens it and says, "Good evening, gentlemen!" He jumps out of the window and disappears.