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I don’t really believe that the specific age matters. “twenty’s” is helpful though as a general age can help us visualize the character better but unless being exactly 23 is important for the story...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/46783 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I don’t really believe that the specific age matters. “twenty’s” is helpful though as a general age can help us visualize the character better but unless being exactly 23 is important for the story (she probably just got a BA if she's following a traditional schooling path so she would be just out of school or fresh to Grad School), I don’t think you really ever need to tell us that she’s 23. But, if you really want to, you could just change the fact that she’s in her twenty’s in chapter two to the fact that she’s 23. Although it’s not necessary, it appears as if you have a very specific view of who this person is so you might want to note she is actually 23.