I think "dirty" is going to vary by definition depending on who is defining it.
I have shot black powder for well over 50 years now - rifle, pistol, smoothbore/shotgun and yes, even full size Civil War artillery. A lot of folks define BP as "dirty" - I don't. The fouling produced by it is a fact of life and even though my guns get "dirty" . . . as well as my hands . . . . that's part of the hobby and the enjoyment of it.
I also reload and shoot a lot of different revolvers - I use Bulls Eye, Red Dot, Unique, Green Dot and a few others. I often hear some complain about how "dirty" their reloads shoot. Personally, I don't consider any of them dirty. Yes, when I'm done I clean my firearms - that process too is all part of the hobby. All I shoot is my cast out of them as well.
You state that after 500 rounds your guns are dirty as well as your hands, etc. Well . . . common sense would sort of dictate that after that many rounds you could easily expect some fouling/dirt/etc. wouldn't it? Yea, I know . . . they call it "smokeless powder" . . . but I don't think I have ever shot any reloads with the above powders that I use that doesn't produce smoke. Out of a revolver, you can still have unburnt residue left as well depending on the barrel length. If you shoot cast, you can get lead residue at the front of you cylinder too. But . . . it's all part of the hobby and shooting.
Over the years, I have often heard some brag on how they "never clean their gun" . . . it's their gun so I guess that that is their prerogative to not clean it. But I'd wager that they are the same people who never service their vehicle, never change the oil in their lawnmower and never add a little lubricant to a lock or a door hinge either. And those types are the same who go "yuck" when they happen to get some dirt under their fingernails as well.
So yea . . . the definition of "dirty" is dependent upon the individual. Personally, I'm more than happy to put up with a "dirty" gun and having to clean it because I enjoy shooting and thank God, we still have that right in this country. Lord only knows there are more Leftist individuals out there that want to take that right away and most of them don't know how to do an honest day's work or are afraid to get their hand's dirty. So for me, I'll put up with "dirty" six shooters and when I'm done, I'll clean them. And since I'm about your age as well, I'll freely admit that the hair loss I suffer from is due to my genes and probably my g-grandfather whose head looked like a billiard ball!
And if you really want to have fun and aren't afraid to get you six gun dirty, load up some BP cartridges and give 'em a try. The smile you'll have on your face is worth the effort you take to clean up afterwards.