Billie Burke was 30 in Peggy when she played the character 'Peggy Cameron'.
That was over 107 years ago in 1916.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
In 1970 she died aged 85, starring in 85 films in her career, 84 of those after Peggy was first released. If she were alive today she would be 138.
In Peggy, I think Billie Burke looks: