Lynda Carter was 22 in A Matter of Wife... and Death when she played the character 'Zelda'.
That was over 49 years ago in 1975.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 72, and has starred in 43 movies in total, 41 of those since A Matter of Wife... and Death was released.
In A Matter of Wife... and Death, I think Lynda Carter looks: