To be blunt, as long as the Golden Age is tied to World War II, most of the original JSA members are guaranteed to die within the next couple of decades. In twenty years, it’ll be hard to accept a 100-year-old running around fighting crime. The only ways to keep them around are to make them immortal or to change continuity and given them a 60-year timeline the way the Silver Age has been given a 12-year timeline.
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And we all know how popular *that* would be!