Audrey a bit old?
Although I think it's a fine movie, it's a bit of a stretch picturing Audrey Hepburn as the virginal young thing she's supposed to be in the early flashbacks. After all, she was 38 when the movie was made. Jackie Bisset [in the choir] was 15 years her junior.
Then again, she looked fine as the older Joanna, and I guess you can't have it both ways. A very nice performance no matter her age.