Juan Cena wrote:
Either way, you have one group of characters (the JSA and other Golden Age characters) whom are forced to age at a normal rate because of being linked to a fixed point in history (barring convoluted explanations why they don't look 70-90) , and another group of characters (the JLA, Titans, et. al ) who exist in an ever-present "now," and rarely, if ever, age.
The difference between the two groups as they interact just keeps getting noticeable as time goes on. The only solution is not for them ever to get together, and I doubt anyone wants that to happen.
Originally they all barely aged, but given that so many of the JSA characters were so strongly set in that time period, they really will not work that well in later periods. Unless you pull an Earth 2 52 style.
Back in the 90s, there was a series of comics called Big Bang. They covered this rather well by simply having the crossovers occur over time as well as dimension. The interactions become explained away as a product of time travel instead of just dimension hoping, should they all co-exist in the same universe. The JLA characters are more modern and a better fit for today, though I some times think that they really should have left them back in the 60s/70s/80s and kept coming up with newer in continuity versions.
But again, the JSA is a 40s era group. They will not really work for the 70s or 80s. Different sensibilities and all.