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In One is a Lonely Number 27-year-old Amy is left by her husband in 1972 San Francisco (I may have been a zygote in that very year and place) so she’s having a whiskey sour with her friend Madge (vodka) and the head of the Divorcees League of Marin County (scotch) who happens to be Janet Leigh. She was 45 at the time.
I have no idea if it was unusual for women to be out drinking alone in that era, though they very much appear to be in a fern bar, an early ‘70s San Franciscan invention meant to be welcoming to women.
(Source: http://en.wikipedia.org/)