Good article. I agree with how you describe your anger as a build up of resentment. Women our age have had to put up with sexism our whole lives. While this is getting better, (maybe?) I can remember so many times in my university years and then during my career of unwanted and demanding attention. This had led to a build up of resentment. Parenting, while rewarding in some ways, was also mostly taken for granted.
As we get older too, there is more comfort in being ourselves, letting our true feelings show.