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[The look on her face is wry is a small upward quirk of her lips that isn't exactly amusement.] Mother definitely doesn't like thinking about her age. So maybe you're right.
[...Which makes her such an uncaring daughter to always bring birthdays up when her Mother is so uncomfortable with them. She'll have to apologize--again.]
It helped me to remember once I realized that the same thing happened at the same time on the same day each year. Great way of keeping track of time.