Originally posted by ptbptb at 2006-10-31 12:18
I suppose it was 阿姨， which seemed to be OK for quite a large group of ages -- perhaps from 18 to 48.
But it is a pity 阿姨 also refers to numerous roles...
It was 阿姨.
It is Ok to call your mother's younger sister 阿姨.
阿姨 is also applicable to any female who is at least 10 years old than the addresser.
As to those who is below that level, I think 姐姐 is the right choice.