That was over 57 years ago in 1964.
Today she is 85, and has starred in 53 movies in total, 47 since Mary Poppins was released.
In Mary Poppins, I think Julie Andrews looks:
Mary Poppins scores 7.5 out of 10 on The Movie Database.
Julie Andrews' first acting role was as 'Lise' in High Tor, released in 1956 when she was 20.