Actor Gena Rowlands, 94, has been living with Alzheimer’s disease for years, her son revealed in a recent interview. When Oscar winner Gena Rowlands appeared in “The Notebook” 20 years ago, she starred as an older version of Rachel McAdams’ character who was living with Alzheimer’s. The prolific 94-year-old actor, who is the widow of director John Cassavetes, has Alzheimer’s, …