Hi! Do you know of any fics where one or both of them are immortal? But they’re still Cap and Iron Man, and not gods or anything. Thanks!

I can only think of a couple that are kind of like that (and you could also try the Vampire recs and Reincarnation recs), but here you go:

So Long by MaxxJacks: Prompt: I’m an immortal from the 1600s and you’ve been around since BC times, does this count as an age gap?Tony finally tells Steve how old he is, sort of.

What Rough Beast by @immoral-crow:
Steve Rogers, super soldier. It’s amazing really that it takes them all
so long to work out just what the serum can do… but given enough time
all things become apparent. This is a story about love, and loss; the
things we would do to be true to ourselves and true to our hearts; and
the prices you must pay to do that.

Just a Little Immortality by shinkonokokoro:
Tony and Steve discover they aren’t aging anymore. So they take a
sabbatical. And travel the world. And become a little out-of-touch.

Something Big for Fifteen Minutes by RedheadAmongWolves: “That could run your heart for fifty lifetimes.”“Yeah. Or something big for fifteen minutes.”It isn’t fifteen minutes.In
which Tony Stark is gonna live a hell of a lot longer than he
originally planned, and he doesn’t really know what to do with that.