That was over 48 years ago in 1973.
Today she is 75, and has starred in 59 movies in total, 54 since Sleeper was released.
In Sleeper, I think Diane Keaton looks:
Sleeper scores 7 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.