I just received an email addressed to myself and a woman colleague my age, with the salutation "Hi, girls."
This is in a business context - the sender is a woman younger than we are, part of a non-profit charity, but she is also a lawyer by profession.
We had met previously in the day to discuss matters of public safety connected to a business endeavor of hers. It was the first time she had met the two of us.
"Girls?" How odd. What say you?