The Golden Age refers pretty much to comics during WWII. The Silver Age starts with the introduction of Barry Allen!Flash, and goes through the sixties, maybe a little beyond.
As DXM notes. Golden Age would include Superman, Batman, Wonder Woman, Captain Marvel and JSA characters from the 40s. (On the Marvel side you'd have the original Captain America, original Human Torch [not the one in the Fantastic Four], and Namor).
This period is when comics were at their height of popularity. I think Superman was churning out a million issues or something ridiculous. It was a lot - much more than today.
Comics went into a funk in the fifties. That's when EC was ascendent with their (mostly) horror comics. Then there was the big comics scandal (congressional hearings, "comics are horrible and rotting the minds of our children" - same rhetoric you hear about Doom and shooter computer games - and the Comics Code).
In the very late fifties, Flash and Green Lantern were completely retooled and reintroduced. The art was gorgeous. The stories were fun (if light). It was a successful reboot of the whole superhero notion which had been languishing fitfully. This is when the Silver Age starts.
Marvel was at that time reduced to some goofy monster comics (still - Jack Kirby and Steve Ditko were doing them). In the early sixties, Stan Lee saw DC's renewed superhero success and decided to try giving the characters more human sized problems. Hence, the Fantastic Four squabbling every which way, and having trouble making their rent and Peter Parker and his many personal problems.
I think the Silver Age (which generally is only really used in discussion of DC characters) goes up to the late sixties when a new generation of writers and artists at DC responded to the challenge of Marvel by making their comics more relevant to the culture around them. I think the Green Lantern/Green Arrow series by Denny O'Neill/Neal Adams (One Sixties Issue Per Issue) marks the end of the Silver Age.
xpost with surprising agreement on the key turning points
The end of the Golden Age is the investigation into comics in the Senate in the early 50s and the disappearance of the superhero from comics.
The defining moment that ends the Silver Age is up for debate, no one can agree when it was. The two most common moments argued over is the death of Gwen Stacy in Spiderman and the Green Lantern/Green Arrow team-up and foray into social consciousness....
I think the Green Lantern/Green Arrow series by Denny O'Neill/Neal Adams (One Sixties Issue Per Issue) marks the end of the Silver Age.
the Green Lantern/Green Arrow team-up and foray into social consciousness....
Sheesh, you'd think there was some kind of hive mind going around these parts.
At its height during WWII, Superman's circulation was over one million copies.
Today, a best-selling comic typically doesn't sell much more than 100,000 copies.
[edited to revise my figures]
Not a, but THE best selling comic of any given month maybe cracks 100K. And that has been a relatively recent return, for a while in late 90s, early oughts, no one was break 75k.
Last time there was multiple titles cracking 100k was in the early 90s speculator bubble.
Then there's Bronze Age, which goes up to about Crisis, IIRC.
Though with Bronze and the seldom-mentioned Copper, it kind of feels like they're just slapping a metal where appropriate or something.
nods head vigorously in agreement with definitions
Kevalier and Clay is all about the Golden Age, for instance, up to and including it's end.
Then there's Bronze Age, which goes up to about Crisis, IIRC.
I don't know that many people who use Bronze Age as a term. It's usually either just Pre-Crisis or Post-Crisis. As you note, it's just a long slide into the base metals at that point.
Other historical markers (in my mind anyway) that mark signal changes in the industry would include things like: Cerebus and Elfquest establishing direct market comics distributed through comic stores instead of 7-11s; Alan Moore taking over Swamp Thing (which ultimately kicks off the Vertigo Line and a whole new market); the media hoopla about Dark Knight, and Miller's Batman Year One reboot; Fantagraphics publishing Love and Rockets (another significant expansion in the market for comics, coincident and tied with indie culture in general); a couple weird rise-and-fall cycles of the industry driven by collector speculation (first the black and white crash by Teenage Mutant Ninja imitators - there were fourteen at one point. Then the Every Comic Is Now Officially #1 Forever, with Multiple Gold Leaf Embossed Covers Collect Them All). Etc. etc.
So what would the line of comics that came after Miller's Dark Knight be considered? Are they Bronze Age or Titanium or just, oooooh dark and nifty?
I'm considering getting back into comics again. I stopped buying X-Men after it split into half a dozen X-titles (or so it seemed to my wallet). I read all of Sandman when it first came out and a hundred or so issues of Hellblazer before I got distracted by something shiny. But I picked up an Ultimate X-Men Ultimate-Spiderman crossover and really enjoyed it.