Time flows differently in the world of superhero comics. Batman can remain in his thirties for decades in the real world, while teenage superheroes can grow into adults in the space of a few issues. Time flows at a speed that is convenient for the writers and the audience, yet for some, it does not flow at all. The worlds of Marvel and DC comics are filled with immortal beings that cannot die from the ravages of old age. They make up some of the most powerful heroes and despicable villains of their respective universes. Immortality does not guarantee a long life, however, and with strange aeons, even death ...

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