What is the main conflict in Three Tall Women by Edward Albee?

The protagonist of the play, a compelling woman of more than ninety years old, reflects on her life with a mixture of shame, pleasure, regret, and satisfaction. She recalls the fun of her childhood and her marriage, when she had an overwhelming optimism for her future. Yet she bitterly recalls the negative events that resulted in regret: her husband's extramarital affairs, the death of her husband, and the estrangement of her gay son.