Mistake 1: Getting the Age Wrong. The most common mistake is misjudging age. Calling a woman in her 50s “姐姐” might be seen as awkward flattery, or even disrespectful. For women of your parents' generation, you should use
阿姨 (āyí). Conversely, calling a teenage girl “姐姐” when you are 30 is incorrect; she is your
妹妹 (mèimei). “姐姐” is for women who are older than you, but generally within the same generation.