I long had an idea of an Elseworlds realistically treating Superboy's becoming an adult. Based on child actors who are never able to escape their youthful image and kid nicknames. Or child prodigies who have to live up to high expectations as they grow up. So that people would continue to call him "Superboy" regardless of how old he gets.
Possibly with a title inspired by "The Man who would be King". "The Boy who Would be Superman" Meaning trying to become but never being. Smallville is certainly an inspiration for this idea. Where everyone tells him for years how great he will become in the future and seems to show no sign of it through his own actions.