creepy old men

I am a server at one of my jobs and we have regulars that come in. They are three older men that usually come in together and eat. Normally this would not be a problem at all because that is usually what regulars do and those are often the nicest people. This particular group of men though, take being nice to a whole another level. They like to "compliment" all the waitresses that work in there but not in a polite, "oh you look nice today," way. It's like they creepily hit on you hard core and I cannot stand it. I mean these men are at least in their forties or fifties and I'm twenty one. It kind of grosses me out in all honesty. None of the girls there like serving these men. Every time they come in and it isn't my turn to pick up a table I am always relieved. I mean it isn't like I can't handle them and how they act but I just don't want to deal with it at all. What young girl would? I just don't understand why these men think that they would even have some sort of a chance at all. It seriously blows my mind. I just don't understand what they're thinking and how it makes sense to them. It's like unless you're Hugh Heffner, just stop. No girl my age in her right mind would go after a creepy old man that's still married and probably has grandkids running around.
It's like I hope in a way that they just do it to freak us out on purpose just to get a good laugh in when we walk away. I could respect that a little bit more then if they're are actually serious. A lot of the times I don't even know what to say in response to what they say to me. I just laugh uncomfortably and walk away thinking to myself "wtf?" If I wasn't serving them though, I would definitely have a few choice words in response to some of their remarks.
It isn't just the some of the regulars at my work that do this either. I get hit on by creepy old men no matter where I go I feel like. The grocery store especially has some wandering around, lurking in the aisles, and as soon as they spot a pretty young girl they have to open their mouths and say the most outrageous things. In those situations all I can do is laugh in their face and walk away. Seriously, I just don't understand it and I don't think I ever will. Any old man that thinks this is a good idea is an idiot and I have no problem telling them exactly that. It is kind of pathetic in a way to see them stoop to those levels. I mean if you want to strike up a normal adult conversation then ok, but I am not going to just sit there and pretend to like some old man telling me how sexy I look or some shit is something that I enjoy. It is actually on my top list of annoyances and although I know this isn't going to change anytime soon I just hope that all the young men out there know that getting old and acting like these creepers is a gross choice of a lifestyle.