I'm thinking of doing just that. I mentioned the incident at work, and the guy at the next desk had a similar problem recently (his wife was with him when he tried to buy a bottle of wine, and didn't have her ID with her). So he's kinda egging me on. Not that it'd do anything, but I'd feel better...
It's true, though, that many older people have no respect for kids.
This is one of my bigger beefs with some of the local public school teachers. I'm aware that there are GOOD teachers in public schools, but a lot of the ones I've met here will talk OPENLY about how they hate dealing with the kids or how the kids have no respect for authority. Hmm...who do you think they learn respect (or the lack thereof) from?