That was over 42 years ago in 1979.
Today she is 75, and has starred in 59 movies in total, 46 since Manhattan was released.
In Manhattan, I think Diane Keaton looks:
Manhattan scores 7.8 out of 10 on The Movie Database.
Diane Keaton's first acting role was as 'Joan Vecchio' in Lovers and Other Strangers, released in 1970 when she was 24.