On most Future Stories, Superman has a bigger life expectancy than humans and outlives Lois even if he is not immortal. On some - Mark Millar's Red Son and Grant Morrison's JLA and All Star Superman - he lives for thousands of years.

What does Superman do when Lois dies?

In the story, Superman (who believed he was dying) revealed his secret identity to her and takes Lois to his Fortress of Solitude to spend her birthday.

Does Lois Lane live forever?

But most importantly, it features the answer to the age-old question of Superman's immortality. ... Lois also lives to a ripe old age and continues working as an intergalactic reporter, thanks to the "Eternity Formula." Though Superman notes dryly that Lois is "sick of the Eternity Formula.