Re: Mixing Up Comic Book Ages
Personally, I don't worry about arbitrary Comic Book Ages when I GM. It can be fun in a meta way; Alan Moore and Kurt Busiek both have a great time playing with / commenting on Comic Book Ages in their Superhero work. Still, meta commentary in a campaign kind of takes me out of it.
I do pay attention to period, which ties into comic book ages but is not quite the same. So, for example, in my WWII game all of the NPC villains (and most of the PC heroes) were based on comic book and pulp characters of the time, then fleshed out to match my ideas of what was interesting, and what contributed to good story telling. I didn't throw in anything that didn't (imo) work given the period, but I also didn't let the limitations of period media get in the way of story telling. Jess Nevin's Pages were the starting point for many of my bad guys and plots.