This picture reminded me of that old Mel Brooks saying: "It's good to be the King." Well, it almost fits, but Prince Charles just looked filthy and fairly inappropriate at a recent ceremony in England. 
The image also forced me to wonder about the tipping point from when you move from a distinguished gentlemen into a filthy old man. I have no concrete data because I'm far from either of them, but my gut feeling is that the shift occurs when you stop wearing underwear, trimming your nose hair and start leaving your pornography on the coffee table out of sheer laziness.
But I think brazenly staring at an officer's breasts with a lecherous smile on your face also qualifies.
-BDS
I think the moment you become a dirty old man is when you start just grabbing women's asses and make all kinds of dirty comments to complete strangers in common places like sidewalks in broad daylight or in the supermarket. Wait, you say you've been doing that since you were twelve. The moment you use "but I'm an old man" as a justification for why you're a pervert. That's it. The moment you use your advanced age as the reason for your sexual perversions is the moment you've become a dirty old man.
I would add, when you stop trimming your EAR hair too.
I would love to know what was actually happening/being said when this picture was taken. You know they are both mortified at what is implied here! rofl
No doubt about that picture...filthy is written all over it!
It looks like ol' Chuckie is going in for the kill with those hands! haha
I agree with WIGSF...that people use being old as an excuse to act pervy.
WhatIgot - Excellent point (s).
It's too bad I can't use the 'old man' excuse without actually being an old man. Details.
Anonymous Boxer - Agreed. And I debated between ear and nose hair for quite awhile before siding with the nose.
Bostonpobble - The look pretty much says it all, but you're right as I would love to know the conversation that went with it - something like "those look great" or "Wow, I forgot what I was saying" seem reasonable to me.
Sarcastic - Some images just bleed filthiness and this is one of them.
Jlee - Exactly. If everyone would just drop the excuses and throw it out on the table, we'd all be better off. Old and young alike. Ha.
I remember my friends drunk 90 year old great uncle at a wedding, tried to grab at my chest and said "If I was only 70 years younger" It was hilarious as he was normally a very quiet lovely man.
And as for you, you're not an old man...but i'm sure you're dirty haha.
Miss Ash - You see that's one benefit of getting older as you can grope at people and they think it's cute. Kind of. Ha. That's not that dirty, eh?
Dirty old men: I have come across a few in the corporate world.
They let you get away with blue murder.
Guy: "Boss, YGF just lost our most important client, crashed the server, and lost 10K on the way to the bank... she is hopeless"
Dirty old man boss: "But she's pretty"
Friday - I guess this dirty old man thing works out for everyone sometimes as it increases the margin for error. Ha.