It's just that a lot of the initial rumours about SM's new girl group about a year ago, sounded like they were gonna have a very similar concept to LOONA (12 members, 4 units). Now all of a sudden LSM is actually working with the real LOONA and the reports coming from SM have changed to only a 4...
I don't think there is a specific age or time that they do it to be honest. Obviously, some companies may have plans and preferences for it but I don't there are really set rules or expectations about when you'd expect them to start auditioning for roles.
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