You would think when you are in your 70's and still married to the same person for almost 40 years why not just stay with them???/
I guess she thinks she will be happier or better off being single at 73. He is not healthy but I guess she is. Maybe she does not want to help take care of him since he is not healthy. If this is the case what a selfish person she is. Maybe she has forgotten the vows she took after all it was 39 years ago.