soulmate mark shows the age your soulmate will be when you meet
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Ninety-nine point eight percent of humans have a soulmate mark that tells them the age their soulmate will be when they meet them. Tony Stark has a mark. It's just that his is...different than most people's.
(Or: six people who aren't Tony Stark's soulmate, and one who is.)
This fic is not Endgame-compliant and contains no spoilers for Endgame.