You don't have to explicitly give her an age. You can show that she's over 18 with a reference ("she was never really into politics. Her friends got mad when she forgot to register to vote.") or even allow her to look a lot younger ("The store clerk looked at her hard. 'I need ID.' She handed it over with an eye roll. The clerk handed her the pack of cigarettes. 'Sorry. You look younger.'")
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