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As long as they remain unmarried, CR2/IR2 beneficiaries will not age out. So age-out is not an acceptable reason for expedite for CR2/IR2 cases.
From https://www.uscis.gov/green-card/green-card-processes-and-procedures/child-status-protection-act-cspa -- "If you are an immediate relative, a VAWA self-petitioning abused spouse or child of a U.S. citizen, or a derivative child of a VAWA self-petitioning abused spouse or child of a U.S. citizen, your age is frozen on the date the Form I-130 or Form I-360 is filed. If you were under the age of 21 at the time the petition was filed, you are eligible for CSPA and will not age out. However, you must remain unmarried in order to qualify."