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age out (of something)
[for an adult] to grow [mentally or in years] out of certain behavior or out of a group or classification that is based on age. (Jargon.) Most of them tend to age out at about 35.
To reach an age at which one is no longer eligible for certain special services, such as education or protection, from an authority: Unfortunately I have aged out of the special student scholarship program, so I have to pay full price for these classes.