And I mean stuff like who belongs to what generation, and how old is each age group.
Personally I think the "DC is about legacy" slogan was mostly 90's marketing propaganda, fueled by the success of Mark Waid's Flash. Definitely DC wasn't kind to their legacy heroes before or after that decade. The different Supergirls, Batgirls, Robins and Titans have often been fridged and served as mega-event cannon fodder. But I digress.
Regardless, I think DC has messed up their legacy characters, and -unsurprisingly to those who know me- I think the roots of that mess can be traced back to the Crisis on Infinite Earths.
Personally, should DC approach me and task me with the unenviable chore of straightening their universe up, this is what their generations would look like.
Earth-Two First Generation: Superman, Batman, Wonder Woman, JSA... In their fifties or sixties.
Earth-Two Second Generation: Power Girl, Huntress, Fury, Silver Scarab, Infinity Inc. In their mid twenties.
Main Earth First Generation: Superman, Batman, Wonder Woman, Justice League, Green Lantern Corps, Vixen, Batwoman, Black Lightning, Steel... Mid-thirties. Superman, Batman, Hal Jordan or Barry Allen should be in his early forties at most.
Main Earth Second Generation: Supergirl, Batgirl, original Titans and New Teen Titans... In their early twenties. Babs should be a little older than Kara and Dick.
Main Earth Third Generation: Kon-El, Cassandra Cain, Cassandra Sandsmark, Stephanie Brown, Stargirl, Bart Allen, Jaime Reyes, younger Titans and Young Justice... In their mid to late teens. Jon Kent and Damian Wayne should be in their early teens, at most.
Thoughts?