Alzheimer’s disease affects a reported 36 million people worldwide. But Meryl Comer had never heard of it when her husband was diagnosed with early-onset Alzheimer’s at age 58. The award-winning journalist gave up her television career to take care of him at home — for nearly two decades. In a new book, she details her life as a caregiver: the struggle to get a diagnosis, the emotional and financial hardships and the limitations of long-term facilities. She says public conversation about the disease should be about earlier diagnosis, so our brain span can match our lifespan. Diane talks with Meryl Comer about her husband’s battle with Alzheimer’s.