MARC AGRONIN is a geriatric psychiatrist in Miami, where his average patient is 90 years old. Based on his experiences working with older people, he challenges the conventional wisdom that as we age, we are less able to change or adapt. And as a result, he says, too often the emotional and mental health issues of the elderly are simply dismissed as an inevitable part of the aging process. In his new book, How We Age: A Doctor’s Journey into the Heart of Growing Old , Agronin explores how our brains and bodies develop and age and how mental illness can change, and be treated, when people reach their 80’s and beyond. Through the stories of his patients, their families and his own experiences, he challenges us to rethink the way we think about getting older.