"Ninety Birthday" is a short play written by David Mamet. It explores themes of aging, memory, and the complexities of family relationships. The narrative centers around a family gathering to celebrate a matriarch's 90th birthday, revealing the dynamics and tensions that arise among the characters. The play highlights the significance of milestones in life and how they can evoke both joy and conflict. As the characters interact, they confront their pasts and the realities of growing older, ultimately reflecting on the importance of connection and understanding within a family.